github.com/undoio/delve@v1.9.0/service/dap/server_test.go

package dap

import (
	"bufio"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"math"
	"math/rand"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"reflect"
	"regexp"
	"runtime"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/undoio/delve/pkg/goversion"
	"github.com/undoio/delve/pkg/logflags"
	"github.com/undoio/delve/pkg/proc"
	protest "github.com/undoio/delve/pkg/proc/test"
	"github.com/undoio/delve/service"
	"github.com/undoio/delve/service/api"
	"github.com/undoio/delve/service/dap/daptest"
	"github.com/undoio/delve/service/debugger"
	"github.com/google/go-dap"
)

const stopOnEntry bool = true
const hasChildren bool = true
const noChildren bool = false

const localsScope = 1000
const globalsScope = 1001

var testBackend string

func TestMain(m *testing.M) {
	logOutputVal := ""
	if _, isTeamCityTest := os.LookupEnv("TEAMCITY_VERSION"); isTeamCityTest {
		logOutputVal = "debugger,dap"
	}
	var logOutput string
	flag.StringVar(&logOutput, "log-output", logOutputVal, "configures log output")
	flag.Parse()
	logflags.Setup(logOutput != "", logOutput, "")
	protest.DefaultTestBackend(&testBackend)
	os.Exit(protest.RunTestsWithFixtures(m))
}

// name is for _fixtures/<name>.go
func runTest(t *testing.T, name string, test func(c *daptest.Client, f protest.Fixture)) {
	runTestBuildFlags(t, name, test, protest.AllNonOptimized)
}

// name is for _fixtures/<name>.go
func runTestBuildFlags(t *testing.T, name string, test func(c *daptest.Client, f protest.Fixture), buildFlags protest.BuildFlags) {
	fixture := protest.BuildFixture(name, buildFlags)

	// Start the DAP server.
	serverStopped := make(chan struct{})
	client := startDAPServerWithClient(t, serverStopped)
	defer client.Close()

	test(client, fixture)
	<-serverStopped
}

func startDAPServerWithClient(t *testing.T, serverStopped chan struct{}) *daptest.Client {
	server, _ := startDAPServer(t, serverStopped)
	client := daptest.NewClient(server.config.Listener.Addr().String())
	return client
}

// Starts an empty server and a stripped down config just to establish a client connection.
// To mock a server created by dap.NewServer(config) or serving dap.NewSession(conn, config, debugger)
// set those arg fields manually after the server creation.
func startDAPServer(t *testing.T, serverStopped chan struct{}) (server *Server, forceStop chan struct{}) {
	// Start the DAP server.
	listener, err := net.Listen("tcp", ":0")
	if err != nil {
		t.Fatal(err)
	}
	disconnectChan := make(chan struct{})
	server = NewServer(&service.Config{
		Listener:       listener,
		DisconnectChan: disconnectChan,
	})
	server.Run()
	// Give server time to start listening for clients
	time.Sleep(100 * time.Millisecond)

	// Run a goroutine that stops the server when disconnectChan is signaled.
	// This helps us test that certain events cause the server to stop as
	// expected.
	forceStop = make(chan struct{})
	go func() {
		defer func() {
			if serverStopped != nil {
				close(serverStopped)
			}
		}()
		select {
		case <-disconnectChan:
			t.Log("server stop triggered internally")
		case <-forceStop:
			t.Log("server stop triggered externally")
		}
		server.Stop()
	}()

	return server, forceStop
}

func verifyServerStopped(t *testing.T, server *Server) {
	t.Helper()
	if server.listener != nil {
		if server.listener.Close() == nil {
			t.Error("server should have closed listener after shutdown")
		}
	}
	verifySessionStopped(t, server.session)
}

func verifySessionStopped(t *testing.T, session *Session) {
	t.Helper()
	if session == nil {
		return
	}
	if session.conn == nil {
		t.Error("session must always have a set connection")
	}
	verifyConnStopped(t, session.conn)
	if session.debugger != nil {
		t.Error("session should have no pointer to debugger after shutdown")
	}
	if session.binaryToRemove != "" {
		t.Error("session should have no binary to remove after shutdown")
	}
}

func verifyConnStopped(t *testing.T, conn io.ReadWriteCloser) {
	t.Helper()
	if conn.Close() == nil {
		t.Error("client connection should be closed after shutdown")
	}
}

func TestStopNoClient(t *testing.T) {
	for name, triggerStop := range map[string]func(s *Server, forceStop chan struct{}){
		"force":        func(s *Server, forceStop chan struct{}) { close(forceStop) },
		"accept error": func(s *Server, forceStop chan struct{}) { s.config.Listener.Close() },
	} {
		t.Run(name, func(t *testing.T) {
			serverStopped := make(chan struct{})
			server, forceStop := startDAPServer(t, serverStopped)
			triggerStop(server, forceStop)
			<-serverStopped
			verifyServerStopped(t, server)
		})
	}
}

func TestStopNoTarget(t *testing.T) {
	for name, triggerStop := range map[string]func(c *daptest.Client, forceStop chan struct{}){
		"force":      func(c *daptest.Client, forceStop chan struct{}) { close(forceStop) },
		"read error": func(c *daptest.Client, forceStop chan struct{}) { c.Close() },
		"disconnect": func(c *daptest.Client, forceStop chan struct{}) { c.DisconnectRequest() },
	} {
		t.Run(name, func(t *testing.T) {
			serverStopped := make(chan struct{})
			server, forceStop := startDAPServer(t, serverStopped)
			client := daptest.NewClient(server.config.Listener.Addr().String())
			defer client.Close()

			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)
			triggerStop(client, forceStop)
			<-serverStopped
			verifyServerStopped(t, server)
		})
	}
}

func TestStopWithTarget(t *testing.T) {
	for name, triggerStop := range map[string]func(c *daptest.Client, forceStop chan struct{}){
		"force":                  func(c *daptest.Client, forceStop chan struct{}) { close(forceStop) },
		"read error":             func(c *daptest.Client, forceStop chan struct{}) { c.Close() },
		"disconnect before exit": func(c *daptest.Client, forceStop chan struct{}) { c.DisconnectRequest() },
		"disconnect after  exit": func(c *daptest.Client, forceStop chan struct{}) {
			c.ContinueRequest(1)
			c.ExpectContinueResponse(t)
			c.ExpectTerminatedEvent(t)
			c.DisconnectRequest()
		},
	} {
		t.Run(name, func(t *testing.T) {
			serverStopped := make(chan struct{})
			server, forceStop := startDAPServer(t, serverStopped)
			client := daptest.NewClient(server.config.Listener.Addr().String())
			defer client.Close()

			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)
			fixture := protest.BuildFixture("increment", protest.AllNonOptimized)
			client.LaunchRequest("debug", fixture.Source, stopOnEntry)
			client.ExpectInitializedEvent(t)
			client.ExpectLaunchResponse(t)
			triggerStop(client, forceStop)
			<-serverStopped
			verifyServerStopped(t, server)
		})
	}
}

func TestSessionStop(t *testing.T) {
	verifySessionState := func(t *testing.T, s *Session, binaryToRemoveSet bool, debuggerSet bool, disconnectChanSet bool) {
		t.Helper()
		if binaryToRemoveSet && s.binaryToRemove == "" || !binaryToRemoveSet && s.binaryToRemove != "" {
			t.Errorf("binaryToRemove: got %s, want set=%v", s.binaryToRemove, binaryToRemoveSet)
		}
		if debuggerSet && s.debugger == nil || !debuggerSet && s.debugger != nil {
			t.Errorf("debugger: got %v, want set=%v", s.debugger, debuggerSet)
		}
		if disconnectChanSet && s.config.DisconnectChan == nil || !disconnectChanSet && s.config.DisconnectChan != nil {
			t.Errorf("disconnectChan: got %v, want set=%v", s.config.DisconnectChan, disconnectChanSet)
		}
	}
	for name, stopSession := range map[string]func(s *Session, c *daptest.Client, serveDone chan struct{}){
		"force": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			s.Close()
			<-serveDone
			verifySessionState(t, s, false /*binaryToRemoveSet*/, false /*debuggerSet*/, false /*disconnectChanSet*/)
		},
		"read error": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			c.Close()
			<-serveDone
			verifyConnStopped(t, s.conn)
			verifySessionState(t, s, true /*binaryToRemoveSet*/, true /*debuggerSet*/, false /*disconnectChanSet*/)
			s.Close()
		},
		"disconnect before exit": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			c.DisconnectRequest()
			<-serveDone
			verifyConnStopped(t, s.conn)
			verifySessionState(t, s, true /*binaryToRemoveSet*/, false /*debuggerSet*/, false /*disconnectChanSet*/)
			s.Close()
		},
		"disconnect after exit": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			c.ContinueRequest(1)
			c.ExpectContinueResponse(t)
			c.ExpectTerminatedEvent(t)
			c.DisconnectRequest()
			<-serveDone
			verifyConnStopped(t, s.conn)
			verifySessionState(t, s, true /*binaryToRemoveSet*/, false /*debuggerSet*/, false /*disconnectChanSet*/)
			s.Close()
		},
	} {
		t.Run(name, func(t *testing.T) {
			listener, err := net.Listen("tcp", ":0")
			if err != nil {
				t.Fatalf("cannot setup listener required for testing: %v", err)
			}
			defer listener.Close()
			acceptDone := make(chan struct{})
			var conn net.Conn
			go func() {
				conn, err = listener.Accept()
				close(acceptDone)
			}()
			time.Sleep(10 * time.Millisecond) // give time to start listening
			client := daptest.NewClient(listener.Addr().String())
			defer client.Close()
			<-acceptDone
			if err != nil {
				t.Fatalf("cannot accept client requireed for testing: %v", err)
			}
			session := NewSession(conn, &Config{
				Config:        &service.Config{DisconnectChan: make(chan struct{})},
				StopTriggered: make(chan struct{})}, nil)
			serveDAPCodecDone := make(chan struct{})
			go func() {
				session.ServeDAPCodec()
				close(serveDAPCodecDone)
			}()
			time.Sleep(10 * time.Millisecond) // give time to start reading
			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)
			fixture := protest.BuildFixture("increment", protest.AllNonOptimized)
			client.LaunchRequest("debug", fixture.Source, stopOnEntry)
			client.ExpectInitializedEvent(t)
			client.ExpectLaunchResponse(t)
			stopSession(session, client, serveDAPCodecDone)
			verifySessionStopped(t, session)
		})
	}
}

func TestForceStopWhileStopping(t *testing.T) {
	serverStopped := make(chan struct{})
	server, forceStop := startDAPServer(t, serverStopped)
	client := daptest.NewClient(server.config.Listener.Addr().String())

	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)
	fixture := protest.BuildFixture("increment", protest.AllNonOptimized)
	client.LaunchRequest("exec", fixture.Path, stopOnEntry)
	client.ExpectInitializedEvent(t)
	client.Close() // depending on timing may trigger Stop()
	time.Sleep(time.Microsecond)
	close(forceStop) // depending on timing may trigger Stop()
	<-serverStopped
	verifyServerStopped(t, server)
}

// TestLaunchStopOnEntry emulates the message exchange that can be observed with
// VS Code for the most basic launch debug session with "stopOnEntry" enabled:
//
//	User selects "Start Debugging":  1 >> initialize
//	                              :  1 << initialize
//	                              :  2 >> launch
//	                              :    << initialized event
//	                              :  2 << launch
//	                              :  3 >> setBreakpoints (empty)
//	                              :  3 << setBreakpoints
//	                              :  4 >> setExceptionBreakpoints (empty)
//	                              :  4 << setExceptionBreakpoints
//	                              :  5 >> configurationDone
//	Program stops upon launching  :    << stopped event
//	                              :  5 << configurationDone
//	                              :  6 >> threads
//	                              :  6 << threads (Dummy)
//	                              :  7 >> threads
//	                              :  7 << threads (Dummy)
//	                              :  8 >> stackTrace
//	                              :  8 << error (Unable to produce stack trace)
//	                              :  9 >> stackTrace
//	                              :  9 << error (Unable to produce stack trace)
//	User evaluates bad expression : 10 >> evaluate
//	                              : 10 << error (unable to find function context)
//	User evaluates good expression: 11 >> evaluate
//	                              : 11 << evaluate
//	User selects "Continue"       : 12 >> continue
//	                              : 12 << continue
//	Program runs to completion    :    << terminated event
//	                              : 13 >> disconnect
//	                              :    << output event (Process exited)
//	                              :    << output event (Detaching)
//	                              : 13 << disconnect
//
// This test exhaustively tests Seq and RequestSeq on all messages from the
// server. Other tests do not necessarily need to repeat all these checks.
func TestLaunchStopOnEntry(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// 1 >> initialize, << initialize
		client.InitializeRequest()
		initResp := client.ExpectInitializeResponseAndCapabilities(t)
		if initResp.Seq != 0 || initResp.RequestSeq != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=1", initResp)
		}

		// 2 >> launch, << initialized, << launch
		client.LaunchRequest("exec", fixture.Path, stopOnEntry)
		initEvent := client.ExpectInitializedEvent(t)
		if initEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", initEvent)
		}
		launchResp := client.ExpectLaunchResponse(t)
		if launchResp.Seq != 0 || launchResp.RequestSeq != 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=2", launchResp)
		}

		// 3 >> setBreakpoints, << setBreakpoints
		client.SetBreakpointsRequest(fixture.Source, nil)
		sbpResp := client.ExpectSetBreakpointsResponse(t)
		if sbpResp.Seq != 0 || sbpResp.RequestSeq != 3 || len(sbpResp.Body.Breakpoints) != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=3, len(Breakpoints)=0", sbpResp)
		}

		// 4 >> setExceptionBreakpoints, << setExceptionBreakpoints
		client.SetExceptionBreakpointsRequest()
		sebpResp := client.ExpectSetExceptionBreakpointsResponse(t)
		if sebpResp.Seq != 0 || sebpResp.RequestSeq != 4 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=4", sebpResp)
		}

		// 5 >> configurationDone, << stopped, << configurationDone
		client.ConfigurationDoneRequest()
		stopEvent := client.ExpectStoppedEvent(t)
		if stopEvent.Seq != 0 ||
			stopEvent.Body.Reason != "entry" ||
			stopEvent.Body.ThreadId != 1 ||
			!stopEvent.Body.AllThreadsStopped {
			t.Errorf("\ngot %#v\nwant Seq=0, Body={Reason=\"entry\", ThreadId=1, AllThreadsStopped=true}", stopEvent)
		}
		cdResp := client.ExpectConfigurationDoneResponse(t)
		if cdResp.Seq != 0 || cdResp.RequestSeq != 5 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=5", cdResp)
		}

		// 6 >> threads, << threads
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)=1", tResp)
		}
		if tResp.Body.Threads[0].Id != 1 || tResp.Body.Threads[0].Name != "Dummy" {
			t.Errorf("\ngot %#v\nwant Id=1, Name=\"Dummy\"", tResp)
		}

		// 7 >> threads, << threads
		client.ThreadsRequest()
		tResp = client.ExpectThreadsResponse(t)
		if tResp.Seq != 0 || tResp.RequestSeq != 7 || len(tResp.Body.Threads) != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=7 len(Threads)=1", tResp)
		}

		// 8 >> stackTrace, << error
		client.StackTraceRequest(1, 0, 20)
		stResp := client.ExpectInvisibleErrorResponse(t)
		if stResp.Seq != 0 || stResp.RequestSeq != 8 || stResp.Body.Error.Format != "Unable to produce stack trace: unknown goroutine 1" {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=8 Format=\"Unable to produce stack trace: unknown goroutine 1\"", stResp)
		}

		// 9 >> stackTrace, << error
		client.StackTraceRequest(1, 0, 20)
		stResp = client.ExpectInvisibleErrorResponse(t)
		if stResp.Seq != 0 || stResp.RequestSeq != 9 || stResp.Body.Error.Id != UnableToProduceStackTrace {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=9 Id=%d", stResp, UnableToProduceStackTrace)
		}

		// 10 >> evaluate, << error
		client.EvaluateRequest("foo", 0 /*no frame specified*/, "repl")
		erResp := client.ExpectInvisibleErrorResponse(t)
		if erResp.Seq != 0 || erResp.RequestSeq != 10 || erResp.Body.Error.Id != UnableToEvaluateExpression {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Id=%d", erResp, UnableToEvaluateExpression)
		}

		// 11 >> evaluate, << evaluate
		client.EvaluateRequest("1+1", 0 /*no frame specified*/, "repl")
		evResp := client.ExpectEvaluateResponse(t)
		if evResp.Seq != 0 || evResp.RequestSeq != 11 || evResp.Body.Result != "2" {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Result=2", evResp)
		}

		// 12 >> continue, << continue, << terminated
		client.ContinueRequest(1)
		contResp := client.ExpectContinueResponse(t)
		if contResp.Seq != 0 || contResp.RequestSeq != 12 || !contResp.Body.AllThreadsContinued {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=12 Body.AllThreadsContinued=true", contResp)
		}
		termEvent := client.ExpectTerminatedEvent(t)
		if termEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", termEvent)
		}

		// 13 >> disconnect, << disconnect
		client.DisconnectRequest()
		oep := client.ExpectOutputEventProcessExited(t, 0)
		if oep.Seq != 0 || oep.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Seq=0 Category='console'", oep)
		}
		oed := client.ExpectOutputEventDetaching(t)
		if oed.Seq != 0 || oed.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Seq=0 Category='console'", oed)
		}
		dResp := client.ExpectDisconnectResponse(t)
		if dResp.Seq != 0 || dResp.RequestSeq != 13 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=13", dResp)
		}
		client.ExpectTerminatedEvent(t)
	})
}

// TestAttachStopOnEntry is like TestLaunchStopOnEntry, but with attach request.
func TestAttachStopOnEntry(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.SkipNow()
	}
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		// Start the program to attach to
		cmd := exec.Command(fixture.Path)
		stdout, err := cmd.StdoutPipe()
		if err != nil {
			t.Fatal(err)
		}
		cmd.Stderr = os.Stderr
		if err := cmd.Start(); err != nil {
			t.Fatal(err)
		}
		// Wait for output.
		// This will give the target process time to initialize the runtime before we attach,
		// so we can rely on having goroutines when they are requested on attach.
		scanOut := bufio.NewScanner(stdout)
		scanOut.Scan()
		if scanOut.Text() != "past main" {
			t.Errorf("expected loopprog.go to output \"past main\"")
		}

		// 1 >> initialize, << initialize
		client.InitializeRequest()
		initResp := client.ExpectInitializeResponseAndCapabilities(t)
		if initResp.Seq != 0 || initResp.RequestSeq != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=1", initResp)
		}

		// 2 >> attach, << initialized, << attach
		client.AttachRequest(
			map[string]interface{}{"mode": "local", "processId": cmd.Process.Pid, "stopOnEntry": true, "backend": "default"})
		client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
		initEvent := client.ExpectInitializedEvent(t)
		if initEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", initEvent)
		}
		attachResp := client.ExpectAttachResponse(t)
		if attachResp.Seq != 0 || attachResp.RequestSeq != 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=2", attachResp)
		}

		// 3 >> setBreakpoints, << setBreakpoints
		client.SetBreakpointsRequest(fixture.Source, nil)
		sbpResp := client.ExpectSetBreakpointsResponse(t)
		if sbpResp.Seq != 0 || sbpResp.RequestSeq != 3 || len(sbpResp.Body.Breakpoints) != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=3, len(Breakpoints)=0", sbpResp)
		}

		// 4 >> setExceptionBreakpoints, << setExceptionBreakpoints
		client.SetExceptionBreakpointsRequest()
		sebpResp := client.ExpectSetExceptionBreakpointsResponse(t)
		if sebpResp.Seq != 0 || sebpResp.RequestSeq != 4 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=4", sebpResp)
		}

		// 5 >> configurationDone, << stopped, << configurationDone
		client.ConfigurationDoneRequest()
		stopEvent := client.ExpectStoppedEvent(t)
		if stopEvent.Seq != 0 ||
			stopEvent.Body.Reason != "entry" ||
			stopEvent.Body.ThreadId != 1 ||
			!stopEvent.Body.AllThreadsStopped {
			t.Errorf("\ngot %#v\nwant Seq=0, Body={Reason=\"entry\", ThreadId=1, AllThreadsStopped=true}", stopEvent)
		}
		cdResp := client.ExpectConfigurationDoneResponse(t)
		if cdResp.Seq != 0 || cdResp.RequestSeq != 5 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=5", cdResp)
		}

		// 6 >> threads, << threads
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		// Expect main goroutine plus runtime at this point.
		if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) < 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)>1", tResp)
		}

		// 7 >> threads, << threads
		client.ThreadsRequest()
		client.ExpectThreadsResponse(t)

		// 8 >> stackTrace, << response
		client.StackTraceRequest(1, 0, 20)
		client.ExpectStackTraceResponse(t)

		// 9 >> stackTrace, << response
		client.StackTraceRequest(1, 0, 20)
		client.ExpectStackTraceResponse(t)

		// 10 >> evaluate, << error
		client.EvaluateRequest("foo", 0 /*no frame specified*/, "repl")
		erResp := client.ExpectInvisibleErrorResponse(t)
		if erResp.Seq != 0 || erResp.RequestSeq != 10 || erResp.Body.Error.Id != UnableToEvaluateExpression {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Id=%d", erResp, UnableToEvaluateExpression)
		}

		// 11 >> evaluate, << evaluate
		client.EvaluateRequest("1+1", 0 /*no frame specified*/, "repl")
		evResp := client.ExpectEvaluateResponse(t)
		if evResp.Seq != 0 || evResp.RequestSeq != 11 || evResp.Body.Result != "2" {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Result=2", evResp)
		}

		// 12 >> continue, << continue
		client.ContinueRequest(1)
		cResp := client.ExpectContinueResponse(t)
		if cResp.Seq != 0 || cResp.RequestSeq != 12 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=12", cResp)
		}

		// TODO(polina): once https://github.com/go-delve/delve/issues/2259 is
		// fixed, test with kill=false.

		// 13 >> disconnect, << disconnect
		client.DisconnectRequestWithKillOption(true)

		// Disconnect consists of Halt + Detach.
		// Halt interrupts command in progress, which triggers
		// a stopped event in parallel with the disconnect
		// sequence. It might arrive before or during the sequence
		// or never if the server exits before it is sent.
		msg := expectMessageFilterStopped(t, client)
		client.CheckOutputEvent(t, msg)
		msg = expectMessageFilterStopped(t, client)
		client.CheckDisconnectResponse(t, msg)
		client.ExpectTerminatedEvent(t)

		// If this call to KeepAlive isn't here there's a chance that stdout will
		// be garbage collected (since it is no longer alive long before this
		// point), when that happens, on unix-like OSes, the read end of the pipe
		// will be closed by the finalizer and the target process will die by
		// SIGPIPE, which the rest of this test does not expect.
		runtime.KeepAlive(stdout)
	})
}

// Like the test above, except the program is configured to continue on entry.
func TestContinueOnEntry(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// 1 >> initialize, << initialize
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)

		// 2 >> launch, << initialized, << launch
		client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
		client.ExpectInitializedEvent(t)
		client.ExpectLaunchResponse(t)

		// 3 >> setBreakpoints, << setBreakpoints
		client.SetBreakpointsRequest(fixture.Source, nil)
		client.ExpectSetBreakpointsResponse(t)

		// 4 >> setExceptionBreakpoints, << setExceptionBreakpoints
		client.SetExceptionBreakpointsRequest()
		client.ExpectSetExceptionBreakpointsResponse(t)

		// 5 >> configurationDone, << configurationDone
		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)
		// "Continue" happens behind the scenes on another goroutine

		client.ExpectTerminatedEvent(t)

		// 6 >> threads, << threads
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)=1", tResp)
		}
		if tResp.Body.Threads[0].Id != 1 || tResp.Body.Threads[0].Name != "Dummy" {
			t.Errorf("\ngot %#v\nwant Id=1, Name=\"Dummy\"", tResp)
		}

		// 7 >> disconnect, << disconnect
		client.DisconnectRequest()
		client.ExpectOutputEventProcessExited(t, 0)
		client.ExpectOutputEventDetaching(t)
		dResp := client.ExpectDisconnectResponse(t)
		if dResp.Seq != 0 || dResp.RequestSeq != 7 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=7", dResp)
		}
		client.ExpectTerminatedEvent(t)
	})
}

// TestPreSetBreakpoint corresponds to a debug session that is configured to
// continue on entry with a pre-set breakpoint.
func TestPreSetBreakpoint(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)

		client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
		client.ExpectInitializedEvent(t)
		client.ExpectLaunchResponse(t)

		client.SetBreakpointsRequest(fixture.Source, []int{8})
		sResp := client.ExpectSetBreakpointsResponse(t)
		if len(sResp.Body.Breakpoints) != 1 {
			t.Errorf("got %#v, want len(Breakpoints)=1", sResp)
		}
		bkpt0 := sResp.Body.Breakpoints[0]
		if !bkpt0.Verified || bkpt0.Line != 8 || bkpt0.Id != 1 || bkpt0.Source.Name != filepath.Base(fixture.Source) || bkpt0.Source.Path != fixture.Source {
			t.Errorf("got breakpoints[0] = %#v, want Verified=true, Line=8, Id=1, Path=%q", bkpt0, fixture.Source)
		}

		client.SetExceptionBreakpointsRequest()
		client.ExpectSetExceptionBreakpointsResponse(t)

		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)
		// This triggers "continue" on a separate goroutine

		client.ThreadsRequest()
		// Since we are in async mode while running, we might receive messages in either order.
		for i := 0; i < 2; i++ {
			msg := client.ExpectMessage(t)
			switch m := msg.(type) {
			case *dap.ThreadsResponse:
				// If the thread request arrived while the program was running, we expect to get the dummy response
				// with a single goroutine "Current".
				// If the thread request arrived after the stop, we should get the goroutine stopped at main.Increment.
				if (len(m.Body.Threads) != 1 || m.Body.Threads[0].Id != -1 || m.Body.Threads[0].Name != "Current") &&
					(len(m.Body.Threads) < 1 || m.Body.Threads[0].Id != 1 || !strings.HasPrefix(m.Body.Threads[0].Name, "* [Go 1] main.Increment")) {
					t.Errorf("\ngot  %#v\nwant Id=-1, Name=\"Current\" or Id=1, Name=\"* [Go 1] main.Increment ...\"", m.Body.Threads)
				}
			case *dap.StoppedEvent:
				if m.Body.Reason != "breakpoint" || m.Body.ThreadId != 1 || !m.Body.AllThreadsStopped {
					t.Errorf("got %#v, want Body={Reason=\"breakpoint\", ThreadId=1, AllThreadsStopped=true}", m)
				}
			default:
				t.Fatalf("got %#v, want ThreadsResponse or StoppedEvent", m)
			}
		}

		// Threads-StackTrace-Scopes-Variables request waterfall is
		// triggered on stop event.
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		if len(tResp.Body.Threads) < 2 { // 1 main + runtime
			t.Errorf("\ngot  %#v\nwant len(Threads)>1", tResp.Body.Threads)
		}
		reMain, _ := regexp.Compile(`\* \[Go 1\] main.Increment \(Thread [0-9]+\)`)
		wantMain := dap.Thread{Id: 1, Name: "* [Go 1] main.Increment (Thread ...)"}
		wantRuntime := dap.Thread{Id: 2, Name: "[Go 2] runtime.gopark"}
		for _, got := range tResp.Body.Threads {
			if got.Id != 1 && !reMain.MatchString(got.Name) && !(strings.Contains(got.Name, "runtime.") || strings.Contains(got.Name, "runtime/")) {
				t.Errorf("\ngot  %#v\nwant []dap.Thread{%#v, %#v, ...}", tResp.Body.Threads, wantMain, wantRuntime)
			}
		}

		client.StackTraceRequest(1, 0, 20)
		stResp := client.ExpectStackTraceResponse(t)

		if stResp.Body.TotalFrames != 6 {
			t.Errorf("\ngot %#v\nwant TotalFrames=6", stResp.Body.TotalFrames)
		}
		if len(stResp.Body.StackFrames) != 6 {
			t.Errorf("\ngot %#v\nwant len(StackFrames)=6", stResp.Body.StackFrames)
		} else {
			checkFrame := func(got dap.StackFrame, id int, name string, sourceName string, line int) {
				t.Helper()
				if got.Id != id || got.Name != name {
					t.Errorf("\ngot  %#v\nwant Id=%d Name=%s", got, id, name)
				}
				if (sourceName != "" && got.Source.Name != sourceName) || (line > 0 && got.Line != line) {
					t.Errorf("\ngot  %#v\nwant Source.Name=%s Line=%d", got, sourceName, line)
				}
			}
			checkFrame(stResp.Body.StackFrames[0], 1000, "main.Increment", "increment.go", 8)
			checkFrame(stResp.Body.StackFrames[1], 1001, "main.Increment", "increment.go", 11)
			checkFrame(stResp.Body.StackFrames[2], 1002, "main.Increment", "increment.go", 11)
			checkFrame(stResp.Body.StackFrames[3], 1003, "main.main", "increment.go", 17)
			checkFrame(stResp.Body.StackFrames[4], 1004, "runtime.main", "proc.go", -1)
			checkFrame(stResp.Body.StackFrames[5], 1005, "runtime.goexit", "", -1)
		}

		client.ScopesRequest(1000)
		scopes := client.ExpectScopesResponse(t)
		if len(scopes.Body.Scopes) > 1 {
			t.Errorf("\ngot  %#v\nwant len(Scopes)=1 (Locals)", scopes)
		}
		checkScope(t, scopes, 0, "Locals", localsScope)

		client.VariablesRequest(localsScope)
		args := client.ExpectVariablesResponse(t)
		checkChildren(t, args, "Locals", 2)
		checkVarExact(t, args, 0, "y", "y", "0 = 0x0", "uint", noChildren)
		checkVarExact(t, args, 1, "~r1", "", "0 = 0x0", "uint", noChildren)

		client.ContinueRequest(1)
		ctResp := client.ExpectContinueResponse(t)
		if !ctResp.Body.AllThreadsContinued {
			t.Errorf("\ngot  %#v\nwant AllThreadsContinued=true", ctResp.Body)
		}
		// "Continue" is triggered after the response is sent

		client.ExpectTerminatedEvent(t)

		// Pause request after termination should result in an error.
		// But in certain cases this request actually succeeds.
		client.PauseRequest(1)
		switch r := client.ExpectMessage(t).(type) {
		case *dap.ErrorResponse:
			if r.Message != "Unable to halt execution" {
				t.Errorf("\ngot  %#v\nwant Message='Unable to halt execution'", r)
			}
		case *dap.PauseResponse:
		default:
			t.Fatalf("Unexpected response type: expect error or pause, got %#v", r)
		}

		client.DisconnectRequest()
		client.ExpectOutputEventProcessExited(t, 0)
		client.ExpectOutputEventDetaching(t)
		client.ExpectDisconnectResponse(t)
		client.ExpectTerminatedEvent(t)
	})
}

// checkStackFramesExact is a helper for verifying the values within StackTraceResponse.
//
//	wantStartName - name of the first returned frame (ignored if "")
//	wantStartLine - file line of the first returned frame (ignored if <0).
//	wantStartID - id of the first frame returned (ignored if wantFrames is 0).
//	wantFrames - number of frames returned (length of StackTraceResponse.Body.StackFrames array).
//	wantTotalFrames - total number of stack frames available (StackTraceResponse.Body.TotalFrames).
func checkStackFramesExact(t *testing.T, got *dap.StackTraceResponse,
	wantStartName string, wantStartLine, wantStartID, wantFrames, wantTotalFrames int) {
	t.Helper()
	checkStackFramesNamed("", t, got, wantStartName, wantStartLine, wantStartID, wantFrames, wantTotalFrames, true)
}

func TestFilterGoroutines(t *testing.T) {
	tt := []struct {
		name    string
		filter  string
		want    []string
		wantLen int
		wantErr bool
	}{
		{
			name:    "user goroutines",
			filter:  "-with user",
			want:    []string{"main.main", "main.agoroutine"},
			wantLen: 11,
		},
		{
			name:    "filter by user loc",
			filter:  "-with userloc main.main",
			want:    []string{"main.main"},
			wantLen: 1,
		},
		{
			name:    "multiple filters",
			filter:  "-with user -with userloc main.agoroutine",
			want:    []string{"main.agoroutine"},
			wantLen: 10,
		},
		{
			name:   "system goroutines",
			filter: "-without user",
			want:   []string{"runtime."},
		},
		// Filters that should return all goroutines.
		{
			name:    "empty filter string",
			filter:  "",
			want:    []string{"main.main", "main.agoroutine", "runtime."},
			wantLen: -1,
		},
		{
			name:    "bad filter string",
			filter:  "not parsable to filters",
			want:    []string{"main.main", "main.agoroutine", "runtime."},
			wantLen: -1,
			wantErr: true,
		},
		// Filters that should produce none.
		{
			name:    "no match to user loc",
			filter:  "-with userloc main.NotAUserFrame",
			want:    []string{"Dummy"},
			wantLen: 1,
		},
		{
			name:    "no match to user and not user",
			filter:  "-with user -without user",
			want:    []string{"Dummy"},
			wantLen: 1,
		},
	}
	runTest(t, "goroutinestackprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode":        "exec",
					"program":     fixture.Path,
					"stopOnEntry": !stopOnEntry})
			},
			// Set breakpoints
			fixture.Source, []int{30},
			[]onBreakpoint{{
				// Stop at line 30
				execute: func() {
					for _, tc := range tt {
						command := fmt.Sprintf("dlv config goroutineFilters %s", tc.filter)
						client.EvaluateRequest(command, 1000, "repl")
						client.ExpectInvalidatedEvent(t)
						client.ExpectEvaluateResponse(t)

						client.ThreadsRequest()
						if tc.wantErr {
							client.ExpectOutputEvent(t)
						}
						tr := client.ExpectThreadsResponse(t)
						if tc.wantLen > 0 && len(tr.Body.Threads) != tc.wantLen {
							t.Errorf("got Threads=%#v, want Len=%d\n", tr.Body.Threads, tc.wantLen)
						}
						for i, frame := range tr.Body.Threads {
							var found bool
							for _, wantName := range tc.want {
								if strings.Contains(frame.Name, wantName) {
									found = true
									break
								}
							}
							if !found {
								t.Errorf("got Threads[%d]=%#v, want Name=%v\n", i, frame, tc.want)
							}
						}
					}
				},
				disconnect: false,
			}})

	})
}

func checkStackFramesHasMore(t *testing.T, got *dap.StackTraceResponse,
	wantStartName string, wantStartLine, wantStartID, wantFrames, wantTotalFrames int) {
	t.Helper()
	checkStackFramesNamed("", t, got, wantStartName, wantStartLine, wantStartID, wantFrames, wantTotalFrames, false)
}
func checkStackFramesNamed(testName string, t *testing.T, got *dap.StackTraceResponse,
	wantStartName string, wantStartLine, wantStartID, wantFrames, wantTotalFrames int, totalExact bool) {
	t.Helper()
	if totalExact && got.Body.TotalFrames != wantTotalFrames {
		t.Errorf("%s\ngot  %#v\nwant TotalFrames=%d", testName, got.Body.TotalFrames, wantTotalFrames)
	} else if !totalExact && got.Body.TotalFrames < wantTotalFrames {
		t.Errorf("%s\ngot  %#v\nwant TotalFrames>=%d", testName, got.Body.TotalFrames, wantTotalFrames)
	}

	if len(got.Body.StackFrames) != wantFrames {
		t.Errorf("%s\ngot  len(StackFrames)=%d\nwant %d", testName, len(got.Body.StackFrames), wantFrames)
	} else {
		// Verify that frame ids are consecutive numbers starting at wantStartID
		for i := 0; i < wantFrames; i++ {
			if got.Body.StackFrames[i].Id != wantStartID+i {
				t.Errorf("%s\ngot  %#v\nwant Id=%d", testName, got.Body.StackFrames[i], wantStartID+i)
			}
		}
		// Verify the name and line corresponding to the first returned frame (if any).
		// This is useful when the first frame is the frame corresponding to the breakpoint at
		// a predefined line. Line values < 0 are a signal to skip the check (which can be useful
		// for frames in the third-party code, where we do not control the lines).
		if wantFrames > 0 && wantStartLine > 0 && got.Body.StackFrames[0].Line != wantStartLine {
			t.Errorf("%s\ngot  Line=%d\nwant %d", testName, got.Body.StackFrames[0].Line, wantStartLine)
		}
		if wantFrames > 0 && wantStartName != "" && got.Body.StackFrames[0].Name != wantStartName {
			t.Errorf("%s\ngot  Name=%s\nwant %s", testName, got.Body.StackFrames[0].Name, wantStartName)
		}
	}
}

// checkScope is a helper for verifying the values within a ScopesResponse.
//
//	i - index of the scope within ScopesRespose.Body.Scopes array
//	name - name of the scope
//	varRef - reference to retrieve variables of this scope. If varRef is negative, the reference is not checked.
func checkScope(t *testing.T, got *dap.ScopesResponse, i int, name string, varRef int) {
	t.Helper()
	if len(got.Body.Scopes) <= i {
		t.Errorf("\ngot  %d\nwant len(Scopes)>%d", len(got.Body.Scopes), i)
	}
	goti := got.Body.Scopes[i]
	if goti.Name != name || (varRef >= 0 && goti.VariablesReference != varRef) || goti.Expensive {
		t.Errorf("\ngot  %#v\nwant Name=%q VariablesReference=%d Expensive=false", goti, name, varRef)
	}
}

// checkChildren is a helper for verifying the number of variables within a VariablesResponse.
//
//	parentName - pseudoname of the enclosing variable or scope (used for error message only)
//	numChildren - number of variables/fields/elements of this variable
func checkChildren(t *testing.T, got *dap.VariablesResponse, parentName string, numChildren int) {
	t.Helper()
	if got.Body.Variables == nil {
		t.Errorf("\ngot  %s children=%#v want []", parentName, got.Body.Variables)
	}
	if len(got.Body.Variables) != numChildren {
		t.Errorf("\ngot  len(%s)=%d (children=%#v)\nwant len=%d", parentName, len(got.Body.Variables), got.Body.Variables, numChildren)
	}
}

// checkVar is a helper for verifying the values within a VariablesResponse.
//
//	i - index of the variable within VariablesRespose.Body.Variables array (-1 will search all vars for a match)
//	name - name of the variable
//	evalName - fully qualified variable name or alternative expression to load this variable
//	value - the value of the variable
//	useExactMatch - true if name, evalName and value are to be compared to exactly, false if to be used as regex
//	hasRef - true if the variable should have children and therefore a non-0 variable reference
//	ref - reference to retrieve children of this variable (0 if none)
func checkVar(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, useExactMatch, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	if len(got.Body.Variables) <= i {
		t.Errorf("\ngot  len=%d (children=%#v)\nwant len>%d", len(got.Body.Variables), got.Body.Variables, i)
		return
	}
	if i < 0 {
		for vi, v := range got.Body.Variables {
			if v.Name == name {
				i = vi
				break
			}
		}
	}
	if i < 0 {
		t.Errorf("\ngot  %#v\nwant Variables[i].Name=%q (not found)", got, name)
		return 0
	}

	goti := got.Body.Variables[i]
	matchedName := false
	if useExactMatch {
		if strings.HasPrefix(name, "~r") {
			matchedName = strings.HasPrefix(goti.Name, "~r")
		} else {
			matchedName = (goti.Name == name)
		}
	} else {
		matchedName, _ = regexp.MatchString(name, goti.Name)
	}
	if !matchedName || (goti.VariablesReference > 0) != hasRef {
		t.Errorf("\ngot  %#v\nwant Name=%q hasRef=%t", goti, name, hasRef)
	}
	matchedEvalName := false
	if useExactMatch {
		matchedEvalName = (goti.EvaluateName == evalName)
	} else {
		matchedEvalName, _ = regexp.MatchString(evalName, goti.EvaluateName)
	}
	if !matchedEvalName {
		t.Errorf("\ngot  %q\nwant EvaluateName=%q", goti.EvaluateName, evalName)
	}
	matchedValue := false
	if useExactMatch {
		matchedValue = (goti.Value == value)
	} else {
		matchedValue, _ = regexp.MatchString(value, goti.Value)
	}
	if !matchedValue {
		t.Errorf("\ngot  %s=%q\nwant %q", name, goti.Value, value)
	}
	matchedType := false
	if useExactMatch {
		matchedType = (goti.Type == typ)
	} else {
		matchedType, _ = regexp.MatchString(typ, goti.Type)
	}
	if !matchedType {
		t.Errorf("\ngot  %s=%q\nwant %q", name, goti.Type, typ)
	}
	if indexed >= 0 && goti.IndexedVariables != indexed {
		t.Errorf("\ngot  %s=%d indexed\nwant %d indexed", name, goti.IndexedVariables, indexed)
	}
	if named >= 0 && goti.NamedVariables != named {
		t.Errorf("\ngot  %s=%d named\nwant %d named", name, goti.NamedVariables, named)
	}
	return goti.VariablesReference
}

// checkVarExact is a helper like checkVar that matches value exactly.
func checkVarExact(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool) (ref int) {
	t.Helper()
	return checkVarExactIndexed(t, got, i, name, evalName, value, typ, hasRef, -1, -1)
}

// checkVarExact is a helper like checkVar that matches value exactly.
func checkVarExactIndexed(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	return checkVar(t, got, i, name, evalName, value, typ, true, hasRef, indexed, named)
}

// checkVarRegex is a helper like checkVar that treats value, evalName or name as a regex.
func checkVarRegex(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool) (ref int) {
	t.Helper()
	return checkVarRegexIndexed(t, got, i, name, evalName, value, typ, hasRef, -1, -1)
}

// checkVarRegex is a helper like checkVar that treats value, evalName or name as a regex.
func checkVarRegexIndexed(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	return checkVar(t, got, i, name, evalName, value, typ, false, hasRef, indexed, named)
}

func expectMessageFilterStopped(t *testing.T, client *daptest.Client) dap.Message {
	msg := client.ExpectMessage(t)
	if _, isStopped := msg.(*dap.StoppedEvent); isStopped {
		msg = client.ExpectMessage(t)
	}
	return msg
}

// validateEvaluateName issues an evaluate request with evaluateName of a variable and
// confirms that it succeeds and returns the same variable record as the original.
func validateEvaluateName(t *testing.T, client *daptest.Client, got *dap.VariablesResponse, i int) {
	t.Helper()
	original := got.Body.Variables[i]
	client.EvaluateRequest(original.EvaluateName, 1000, "this context will be ignored")
	validated := client.ExpectEvaluateResponse(t)
	if original.VariablesReference == 0 && validated.Body.VariablesReference != 0 ||
		original.VariablesReference != 0 && validated.Body.VariablesReference == 0 {
		t.Errorf("\ngot  varref=%d\nwant %d", validated.Body.VariablesReference, original.VariablesReference)
	}
	// The variable might not be fully loaded, and when we reload it with an expression
	// more of the subvalues might be revealed, so we must match the loaded prefix only.
	if strings.Contains(original.Value, "...") {
		origLoaded := strings.Split(original.Value, "...")[0]
		if !strings.HasPrefix(validated.Body.Result, origLoaded) {
			t.Errorf("\ngot  value=%q\nwant %q", validated.Body.Result, original.Value)
		}
	} else if original.Value != validated.Body.Result {
		t.Errorf("\ngot  value=%q\nwant %q", validated.Body.Result, original.Value)
	}
}

// TestStackTraceRequest executes to a breakpoint and tests different
// good and bad configurations of 'stackTrace' requests.
func TestStackTraceRequest(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		var stResp *dap.StackTraceResponse
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{8, 18},
			[]onBreakpoint{{
				// Stop at line 8
				execute: func() {
					// Even though the stack frames do not change,
					// repeated requests at the same breakpoint
					// would assign next block of unique ids to them each time.
					const NumFrames = 6
					reqIndex := 0
					frameID := func() int {
						return startHandle + reqIndex
					}

					tests := map[string]struct {
						startFrame          int
						levels              int
						wantStartName       string
						wantStartLine       int
						wantStartFrame      int
						wantFramesReturned  int
						wantFramesAvailable int
						exact               bool
					}{
						"all frame levels from 0 to NumFrames":    {0, NumFrames, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"subset of frames from 1 to -1":           {1, NumFrames - 1, "main.Increment", 11, 1, NumFrames - 1, NumFrames, true},
						"load stack in pages: first half":         {0, NumFrames / 2, "main.Increment", 8, 0, NumFrames / 2, NumFrames, false},
						"load stack in pages: second half":        {NumFrames / 2, NumFrames, "main.main", 17, NumFrames / 2, NumFrames / 2, NumFrames, true},
						"zero levels means all levels":            {0, 0, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"zero levels means all remaining levels":  {NumFrames / 2, 0, "main.main", 17, NumFrames / 2, NumFrames / 2, NumFrames, true},
						"negative levels treated as 0 (all)":      {0, -10, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"OOB levels is capped at available len":   {0, NumFrames + 1, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"OOB levels is capped at available len 1": {1, NumFrames + 1, "main.Increment", 11, 1, NumFrames - 1, NumFrames, true},
						"negative startFrame treated as 0":        {-10, 0, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"OOB startFrame returns empty trace":      {NumFrames, 0, "main.Increment", -1, -1, 0, NumFrames, true},
					}
					for name, tc := range tests {
						client.StackTraceRequest(1, tc.startFrame, tc.levels)
						stResp = client.ExpectStackTraceResponse(t)
						checkStackFramesNamed(name, t, stResp,
							tc.wantStartName, tc.wantStartLine, frameID(), tc.wantFramesReturned, tc.wantFramesAvailable, tc.exact)
						reqIndex += len(stResp.Body.StackFrames)
					}
				},
				disconnect: false,
			}, {
				// Stop at line 18
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 0)
					stResp = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stResp, "main.main", 18, startHandle, 3, 3)

				},
				disconnect: false,
			}})
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		var stResp *dap.StackTraceResponse
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{8, 18},
			[]onBreakpoint{{
				// Stop at line 8
				execute: func() {
					// Even though the stack frames do not change,
					// repeated requests at the same breakpoint
					// would assign next block of unique ids to them each time.
					const NumFrames = 6

					var frames []dap.StackFrame

					for start, levels := 0, 1; start < NumFrames; {
						client.StackTraceRequest(1, start, levels)
						stResp = client.ExpectStackTraceResponse(t)
						frames = append(frames, stResp.Body.StackFrames...)
						if stResp.Body.TotalFrames < NumFrames {
							t.Errorf("got  %#v\nwant TotalFrames>=%d\n", stResp.Body.TotalFrames, NumFrames)
						}

						if len(stResp.Body.StackFrames) < levels {
							t.Errorf("got  len(StackFrames)=%d\nwant >=%d\n", len(stResp.Body.StackFrames), levels)
						}

						start += len(stResp.Body.StackFrames)
					}

					// TODO check all the frames.
					want := []struct {
						wantName string
						wantLine int
					}{
						{"main.Increment", 8},
						{"main.Increment", 11},
						{"main.Increment", 11},
						{"main.main", 17},
						{"runtime.main", 0},
						{"runtime.goexit", 0},
					}
					for i, frame := range frames {
						frameId := startHandle + i
						if frame.Id != frameId {
							t.Errorf("got  %#v\nwant Id=%d\n", frame, frameId)
						}

						// Verify the name and line corresponding to the first returned frame (if any).
						// This is useful when the first frame is the frame corresponding to the breakpoint at
						// a predefined line. Line values < 0 are a signal to skip the check (which can be useful
						// for frames in the third-party code, where we do not control the lines).
						if want[i].wantLine > 0 && frame.Line != want[i].wantLine {
							t.Errorf("got  Line=%d\nwant %d\n", frame.Line, want[i].wantLine)
						}
						if want[i].wantName != "" && frame.Name != want[i].wantName {
							t.Errorf("got  Name=%s\nwant %s\n", frame.Name, want[i].wantName)
						}
					}
				},
				disconnect: false,
			}, {
				// Stop at line 18
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 0)
					stResp = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stResp, "main.main", 18, startHandle, 3, 3)
				},
				disconnect: false,
			}})
	})
}

func TestSelectedThreadsRequest(t *testing.T) {
	runTest(t, "goroutinestackprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{20},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 20)

					defaultMaxGoroutines := maxGoroutines
					defer func() { maxGoroutines = defaultMaxGoroutines }()

					maxGoroutines = 1
					client.SetBreakpointsRequest(fixture.Source, []int{8})
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || se.Body.ThreadId == 1 {
						t.Errorf("got %#v, want Reason=%q, ThreadId!=1", se, "breakpoint")
					}

					client.ThreadsRequest()
					oe := client.ExpectOutputEvent(t)
					if !strings.HasPrefix(oe.Body.Output, "Too many goroutines") {
						t.Errorf("got %#v, expected Output=\"Too many goroutines...\"\n", oe)

					}
					tr := client.ExpectThreadsResponse(t)

					if len(tr.Body.Threads) != 2 {
						t.Errorf("got %d threads, expected 2\n", len(tr.Body.Threads))
					}

					var selectedFound bool
					for _, thread := range tr.Body.Threads {
						if thread.Id == se.Body.ThreadId {
							selectedFound = true
							break
						}
					}
					if !selectedFound {
						t.Errorf("got %#v, want ThreadId=%d\n", tr.Body.Threads, se.Body.ThreadId)
					}
				},
				disconnect: true,
			}})

	})
}

func TestHideSystemGoroutinesRequest(t *testing.T) {
	tests := []struct{ hideSystemGoroutines bool }{
		{hideSystemGoroutines: true},
		{hideSystemGoroutines: false},
	}
	for _, tt := range tests {
		runTest(t, "goroutinestackprog", func(client *daptest.Client, fixture protest.Fixture) {
			runDebugSessionWithBPs(t, client, "launch",
				// Launch
				func() {
					client.LaunchRequestWithArgs(map[string]interface{}{
						"mode":                 "exec",
						"program":              fixture.Path,
						"hideSystemGoroutines": tt.hideSystemGoroutines,
						"stopOnEntry":          !stopOnEntry,
					})
				},
				// Set breakpoints
				fixture.Source, []int{25},
				[]onBreakpoint{{
					execute: func() {
						checkStop(t, client, 1, "main.main", 25)

						client.ThreadsRequest()
						tr := client.ExpectThreadsResponse(t)

						// The user process creates 10 goroutines in addition to the
						// main goroutine, for a total of 11 goroutines.
						userCount := 11
						if tt.hideSystemGoroutines {
							if len(tr.Body.Threads) != userCount {
								t.Errorf("got %d goroutines, expected %d\n", len(tr.Body.Threads), userCount)
							}
						} else {
							if len(tr.Body.Threads) <= userCount {
								t.Errorf("got %d goroutines, expected >%d\n", len(tr.Body.Threads), userCount)
							}
						}
					},
					disconnect: true,
				}})
		})
	}
}

// TestScopesAndVariablesRequests executes to a breakpoint and tests different
// configurations of 'scopes' and 'variables' requests.
func TestScopesAndVariablesRequests(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true, "backend": "default",
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at first breakpoint
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)

					startLineno := 66
					if runtime.GOOS == "windows" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 15) {
						// Go1.15 on windows inserts a NOP after the call to
						// runtime.Breakpoint and marks it same line as the
						// runtime.Breakpoint call, making this flaky, so skip the line check.
						startLineno = -1
					}

					checkStackFramesExact(t, stack, "main.foobar", startLineno, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)

					// Globals

					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)
					checkVarExact(t, globals, 0, "p1", "main.p1", "10", "int", noChildren)

					// Locals

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 33)
					checkVarExact(t, locals, 0, "baz", "baz", `"bazburzum"`, "string", noChildren)
					ref := checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						bar := client.ExpectVariablesResponse(t)
						checkChildren(t, bar, "bar", 2)
						checkVarExact(t, bar, 0, "Baz", "bar.Baz", "10", "int", noChildren)
						checkVarExact(t, bar, 1, "Bur", "bar.Bur", `"lorem"`, "string", noChildren)
						validateEvaluateName(t, client, bar, 0)
						validateEvaluateName(t, client, bar, 1)
					}

					// reflect.Kind == Bool
					checkVarExact(t, locals, -1, "b1", "b1", "true", "bool", noChildren)
					checkVarExact(t, locals, -1, "b2", "b2", "false", "bool", noChildren)
					// reflect.Kind == Int
					checkVarExact(t, locals, -1, "a2", "a2", "6", "int", noChildren)
					checkVarExact(t, locals, -1, "neg", "neg", "-1", "int", noChildren)
					// reflect.Kind == Int8
					checkVarExact(t, locals, -1, "i8", "i8", "1", "int8", noChildren)
					// reflect.Kind == Int16 - see testvariables2
					// reflect.Kind == Int32 - see testvariables2
					// reflect.Kind == Int64 - see testvariables2
					// reflect.Kind == Uint
					// reflect.Kind == Uint8
					checkVarExact(t, locals, -1, "u8", "u8", "255 = 0xff", "uint8", noChildren)
					// reflect.Kind == Uint16
					checkVarExact(t, locals, -1, "u16", "u16", "65535 = 0xffff", "uint16", noChildren)
					// reflect.Kind == Uint32
					checkVarExact(t, locals, -1, "u32", "u32", "4294967295 = 0xffffffff", "uint32", noChildren)
					// reflect.Kind == Uint64
					checkVarExact(t, locals, -1, "u64", "u64", "18446744073709551615 = 0xffffffffffffffff", "uint64", noChildren)
					// reflect.Kind == Uintptr
					checkVarExact(t, locals, -1, "up", "up", "5 = 0x5", "uintptr", noChildren)
					// reflect.Kind == Float32
					checkVarExact(t, locals, -1, "f32", "f32", "1.2", "float32", noChildren)
					// reflect.Kind == Float64
					checkVarExact(t, locals, -1, "a3", "a3", "7.23", "float64", noChildren)
					// reflect.Kind == Complex64
					ref = checkVarExact(t, locals, -1, "c64", "c64", "(1 + 2i)", "complex64", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						c64 := client.ExpectVariablesResponse(t)
						checkChildren(t, c64, "c64", 2)
						checkVarExact(t, c64, 0, "real", "", "1", "float32", noChildren)
						checkVarExact(t, c64, 1, "imaginary", "", "2", "float32", noChildren)
					}
					// reflect.Kind == Complex128
					ref = checkVarExact(t, locals, -1, "c128", "c128", "(2 + 3i)", "complex128", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						c128 := client.ExpectVariablesResponse(t)
						checkChildren(t, c128, "c128", 2)
						checkVarExact(t, c128, 0, "real", "", "2", "float64", noChildren)
						checkVarExact(t, c128, 1, "imaginary", "", "3", "float64", noChildren)
					}
					// reflect.Kind == Array
					ref = checkVarExact(t, locals, -1, "a4", "a4", "[2]int [1,2]", "[2]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a4 := client.ExpectVariablesResponse(t)
						checkChildren(t, a4, "a4", 2)
						checkVarExact(t, a4, 0, "[0]", "a4[0]", "1", "int", noChildren)
						checkVarExact(t, a4, 1, "[1]", "a4[1]", "2", "int", noChildren)
					}
					ref = checkVarExact(t, locals, -1, "a11", "a11", `[3]main.FooBar [{Baz: 1, Bur: "a"},{Baz: 2, Bur: "b"},{Baz: 3, Bur: "c"}]`, "[3]main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a11 := client.ExpectVariablesResponse(t)
						checkChildren(t, a11, "a11", 3)
						checkVarExact(t, a11, 0, "[0]", "a11[0]", `main.FooBar {Baz: 1, Bur: "a"}`, "main.FooBar", hasChildren)
						ref = checkVarExact(t, a11, 1, "[1]", "a11[1]", `main.FooBar {Baz: 2, Bur: "b"}`, "main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a11_1 := client.ExpectVariablesResponse(t)
							checkChildren(t, a11_1, "a11[1]", 2)
							checkVarExact(t, a11_1, 0, "Baz", "a11[1].Baz", "2", "int", noChildren)
							checkVarExact(t, a11_1, 1, "Bur", "a11[1].Bur", `"b"`, "string", noChildren)
							validateEvaluateName(t, client, a11_1, 0)
							validateEvaluateName(t, client, a11_1, 1)
						}
						checkVarExact(t, a11, 2, "[2]", "a11[2]", `main.FooBar {Baz: 3, Bur: "c"}`, "main.FooBar", hasChildren)
					}

					// reflect.Kind == Chan - see testvariables2
					// reflect.Kind == Func - see testvariables2
					// reflect.Kind == Interface - see testvariables2
					// reflect.Kind == Map - see testvariables2
					// reflect.Kind == Ptr
					ref = checkVarExact(t, locals, -1, "a7", "a7", `*main.FooBar {Baz: 5, Bur: "strum"}`, "*main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a7 := client.ExpectVariablesResponse(t)
						checkChildren(t, a7, "a7", 1)
						ref = checkVarExact(t, a7, 0, "", "(*a7)", `main.FooBar {Baz: 5, Bur: "strum"}`, "main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a7val := client.ExpectVariablesResponse(t)
							checkChildren(t, a7val, "*a7", 2)
							checkVarExact(t, a7val, 0, "Baz", "(*a7).Baz", "5", "int", noChildren)
							checkVarExact(t, a7val, 1, "Bur", "(*a7).Bur", `"strum"`, "string", noChildren)
							validateEvaluateName(t, client, a7val, 0)
							validateEvaluateName(t, client, a7val, 1)
						}
					}
					// TODO(polina): how to test for "nil" (without type) and "void"?
					checkVarExact(t, locals, -1, "a9", "a9", "*main.FooBar nil", "*main.FooBar", noChildren)
					// reflect.Kind == Slice
					ref = checkVarExact(t, locals, -1, "a5", "a5", "[]int len: 5, cap: 5, [1,2,3,4,5]", "[]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a5 := client.ExpectVariablesResponse(t)
						checkChildren(t, a5, "a5", 5)
						checkVarExact(t, a5, 0, "[0]", "a5[0]", "1", "int", noChildren)
						checkVarExact(t, a5, 4, "[4]", "a5[4]", "5", "int", noChildren)
						validateEvaluateName(t, client, a5, 0)
						validateEvaluateName(t, client, a5, 1)
					}
					ref = checkVarExact(t, locals, -1, "a12", "a12", `[]main.FooBar len: 2, cap: 2, [{Baz: 4, Bur: "d"},{Baz: 5, Bur: "e"}]`, "[]main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a12 := client.ExpectVariablesResponse(t)
						checkChildren(t, a12, "a12", 2)
						checkVarExact(t, a12, 0, "[0]", "a12[0]", `main.FooBar {Baz: 4, Bur: "d"}`, "main.FooBar", hasChildren)
						ref = checkVarExact(t, a12, 1, "[1]", "a12[1]", `main.FooBar {Baz: 5, Bur: "e"}`, "main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a12_1 := client.ExpectVariablesResponse(t)
							checkChildren(t, a12_1, "a12[1]", 2)
							checkVarExact(t, a12_1, 0, "Baz", "a12[1].Baz", "5", "int", noChildren)
							checkVarExact(t, a12_1, 1, "Bur", "a12[1].Bur", `"e"`, "string", noChildren)
							validateEvaluateName(t, client, a12_1, 0)
							validateEvaluateName(t, client, a12_1, 1)
						}
					}
					ref = checkVarExact(t, locals, -1, "a13", "a13", `[]*main.FooBar len: 3, cap: 3, [*{Baz: 6, Bur: "f"},*{Baz: 7, Bur: "g"},*{Baz: 8, Bur: "h"}]`, "[]*main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a13 := client.ExpectVariablesResponse(t)
						checkChildren(t, a13, "a13", 3)
						checkVarExact(t, a13, 0, "[0]", "a13[0]", `*main.FooBar {Baz: 6, Bur: "f"}`, "*main.FooBar", hasChildren)
						checkVarExact(t, a13, 1, "[1]", "a13[1]", `*main.FooBar {Baz: 7, Bur: "g"}`, "*main.FooBar", hasChildren)
						ref = checkVarExact(t, a13, 2, "[2]", "a13[2]", `*main.FooBar {Baz: 8, Bur: "h"}`, "*main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a13_2 := client.ExpectVariablesResponse(t)
							checkChildren(t, a13_2, "a13[2]", 1)
							ref = checkVarExact(t, a13_2, 0, "", "(*a13[2])", `main.FooBar {Baz: 8, Bur: "h"}`, "main.FooBar", hasChildren)
							validateEvaluateName(t, client, a13_2, 0)
							if ref > 0 {
								client.VariablesRequest(ref)
								val := client.ExpectVariablesResponse(t)
								checkChildren(t, val, "*a13[2]", 2)
								checkVarExact(t, val, 0, "Baz", "(*a13[2]).Baz", "8", "int", noChildren)
								checkVarExact(t, val, 1, "Bur", "(*a13[2]).Bur", `"h"`, "string", noChildren)
								validateEvaluateName(t, client, val, 0)
								validateEvaluateName(t, client, val, 1)
							}
						}
					}
					// reflect.Kind == String
					checkVarExact(t, locals, -1, "a1", "a1", `"foofoofoofoofoofoo"`, "string", noChildren)
					checkVarExact(t, locals, -1, "a10", "a10", `"ofo"`, "string", noChildren)
					// reflect.Kind == Struct
					ref = checkVarExact(t, locals, -1, "a6", "a6", `main.FooBar {Baz: 8, Bur: "word"}`, "main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a6 := client.ExpectVariablesResponse(t)
						checkChildren(t, a6, "a6", 2)
						checkVarExact(t, a6, 0, "Baz", "a6.Baz", "8", "int", noChildren)
						checkVarExact(t, a6, 1, "Bur", "a6.Bur", `"word"`, "string", noChildren)
					}
					ref = checkVarExact(t, locals, -1, "a8", "a8", `main.FooBar2 {Bur: 10, Baz: "feh"}`, "main.FooBar2", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a8 := client.ExpectVariablesResponse(t)
						checkChildren(t, a8, "a8", 2)
						checkVarExact(t, a8, 0, "Bur", "a8.Bur", "10", "int", noChildren)
						checkVarExact(t, a8, 1, "Baz", "a8.Baz", `"feh"`, "string", noChildren)
					}
					// reflect.Kind == UnsafePointer - see testvariables2
				},
				disconnect: false,
			}, {
				// Stop at second breakpoint
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.barfoo", 27, 1000, 5, 5)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)

					client.ScopesRequest(1111)
					erres := client.ExpectInvisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to list locals: unknown frame id 1111" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to list locals: unknown frame id 1111\"", erres)
					}

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 1)
					checkVarExact(t, locals, -1, "a1", "a1", `"bur"`, "string", noChildren)

					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)
					checkVarExact(t, globals, 0, "p1", "main.p1", "10", "int", noChildren)

					client.VariablesRequest(7777)
					erres = client.ExpectInvisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to lookup variable: unknown reference 7777" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to lookup variable: unknown reference 7777\"", erres)
					}
				},
				disconnect: false,
			}})
	})
}

// TestScopesAndVariablesRequests2 executes to a breakpoint and tests different
// configurations of 'scopes' and 'variables' requests.
func TestScopesAndVariablesRequests2(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", -1, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
				},
				disconnect: false,
			}, {
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", -1, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					if len(scopes.Body.Scopes) > 1 {
						t.Errorf("\ngot  %#v\nwant len(scopes)=1 (Argumes & Locals)", scopes)
					}
					checkScope(t, scopes, 0, "Locals", localsScope)

					// Locals
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// reflect.Kind == Bool - see testvariables
					// reflect.Kind == Int - see testvariables
					// reflect.Kind == Int8
					checkVarExact(t, locals, -1, "ni8", "ni8", "-5", "int8", noChildren)
					// reflect.Kind == Int16
					checkVarExact(t, locals, -1, "ni16", "ni16", "-5", "int16", noChildren)
					// reflect.Kind == Int32
					checkVarExact(t, locals, -1, "ni32", "ni32", "-5", "int32", noChildren)
					// reflect.Kind == Int64
					checkVarExact(t, locals, -1, "ni64", "ni64", "-5", "int64", noChildren)
					// reflect.Kind == Uint
					// reflect.Kind == Uint8 - see testvariables
					// reflect.Kind == Uint16 - see testvariables
					// reflect.Kind == Uint32 - see testvariables
					// reflect.Kind == Uint64 - see testvariables
					// reflect.Kind == Uintptr - see testvariables
					// reflect.Kind == Float32 - see testvariables
					// reflect.Kind == Float64
					checkVarExact(t, locals, -1, "pinf", "pinf", "+Inf", "float64", noChildren)
					checkVarExact(t, locals, -1, "ninf", "ninf", "-Inf", "float64", noChildren)
					checkVarExact(t, locals, -1, "nan", "nan", "NaN", "float64", noChildren)
					// reflect.Kind == Complex64 - see testvariables
					// reflect.Kind == Complex128 - see testvariables
					// reflect.Kind == Array
					checkVarExact(t, locals, -1, "a0", "a0", "[0]int []", "[0]int", noChildren)
					// reflect.Kind == Chan
					ref := checkVarExact(t, locals, -1, "ch1", "ch1", "chan int 4/11", "chan int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						ch1 := client.ExpectVariablesResponse(t)
						checkChildren(t, ch1, "ch1", 11)
						checkVarExact(t, ch1, 0, "qcount", "ch1.qcount", "4 = 0x4", "uint", noChildren)
						checkVarRegex(t, ch1, 10, "lock", "ch1.lock", `runtime\.mutex {.*key: 0.*}`, `runtime\.mutex`, hasChildren)
						validateEvaluateName(t, client, ch1, 0)
						validateEvaluateName(t, client, ch1, 10)
					}
					checkVarExact(t, locals, -1, "chnil", "chnil", "chan int nil", "chan int", noChildren)
					// reflect.Kind == Func
					checkVarExact(t, locals, -1, "fn1", "fn1", "main.afunc", "main.functype", noChildren)
					checkVarExact(t, locals, -1, "fn2", "fn2", "nil", "main.functype", noChildren)
					// reflect.Kind == Interface
					checkVarExact(t, locals, -1, "ifacenil", "ifacenil", "interface {} nil", "interface {}", noChildren)
					ref = checkVarExact(t, locals, -1, "iface2", "iface2", "interface {}(string) \"test\"", "interface {}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						iface2 := client.ExpectVariablesResponse(t)
						checkChildren(t, iface2, "iface2", 1)
						checkVarExact(t, iface2, 0, "data", "iface2.(data)", `"test"`, "string", noChildren)
						validateEvaluateName(t, client, iface2, 0)
					}
					ref = checkVarExact(t, locals, -1, "iface4", "iface4", "interface {}([]go/constant.Value) [4]", "interface {}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						iface4 := client.ExpectVariablesResponse(t)
						checkChildren(t, iface4, "iface4", 1)
						ref = checkVarExact(t, iface4, 0, "data", "iface4.(data)", "[]go/constant.Value len: 1, cap: 1, [4]", "[]go/constant.Value", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							iface4data := client.ExpectVariablesResponse(t)
							checkChildren(t, iface4data, "iface4.data", 1)
							ref = checkVarExact(t, iface4data, 0, "[0]", "iface4.(data)[0]", "go/constant.Value(go/constant.int64Val) 4", "go/constant.Value", hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								iface4data0 := client.ExpectVariablesResponse(t)
								checkChildren(t, iface4data0, "iface4.data[0]", 1)
								checkVarExact(t, iface4data0, 0, "data", "iface4.(data)[0].(data)", "4", "go/constant.int64Val", noChildren)
								validateEvaluateName(t, client, iface4data0, 0)
							}
						}
					}
					checkVarExact(t, locals, -1, "errnil", "errnil", "error nil", "error", noChildren)
					ref = checkVarExact(t, locals, -1, "err1", "err1", "error(*main.astruct) *{A: 1, B: 2}", "error", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						err1 := client.ExpectVariablesResponse(t)
						checkChildren(t, err1, "err1", 1)
						checkVarExact(t, err1, 0, "data", "err1.(data)", "*main.astruct {A: 1, B: 2}", "*main.astruct", hasChildren)
						validateEvaluateName(t, client, err1, 0)
					}
					ref = checkVarExact(t, locals, -1, "ptrinf", "ptrinf", "*interface {}(**interface {}) **...", "*interface {}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						ptrinf_val := client.ExpectVariablesResponse(t)
						checkChildren(t, ptrinf_val, "*ptrinf", 1)
						ref = checkVarExact(t, ptrinf_val, 0, "", "(*ptrinf)", "interface {}(**interface {}) **...", "interface {}", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							ptrinf_val_data := client.ExpectVariablesResponse(t)
							checkChildren(t, ptrinf_val_data, "(*ptrinf).data", 1)
							checkVarExact(t, ptrinf_val_data, 0, "data", "(*ptrinf).(data)", "**interface {}(**interface {}) ...", "**interface {}", hasChildren)
							validateEvaluateName(t, client, ptrinf_val_data, 0)
						}
					}
					// reflect.Kind == Map
					checkVarExact(t, locals, -1, "mnil", "mnil", "map[string]main.astruct nil", "map[string]main.astruct", noChildren)
					// key - scalar, value - compound
					ref = checkVarExact(t, locals, -1, "m2", "m2", "map[int]*main.astruct [1: *{A: 10, B: 11}, ]", "map[int]*main.astruct", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m2 := client.ExpectVariablesResponse(t)
						checkChildren(t, m2, "m2", 2) // each key-value represented by a single child
						checkVarExact(t, m2, 0, "len()", "len(m2)", "1", "int", noChildren)
						ref = checkVarExact(t, m2, 1, "1", "m2[1]", "*main.astruct {A: 10, B: 11}", "int: *main.astruct", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m2kv1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m2kv1, "m2[1]", 1)
							ref = checkVarExact(t, m2kv1, 0, "", "(*m2[1])", "main.astruct {A: 10, B: 11}", "main.astruct", hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								m2kv1deref := client.ExpectVariablesResponse(t)
								checkChildren(t, m2kv1deref, "*m2[1]", 2)
								checkVarExact(t, m2kv1deref, 0, "A", "(*m2[1]).A", "10", "int", noChildren)
								checkVarExact(t, m2kv1deref, 1, "B", "(*m2[1]).B", "11", "int", noChildren)
								validateEvaluateName(t, client, m2kv1deref, 0)
								validateEvaluateName(t, client, m2kv1deref, 1)
							}
						}
					}
					// key - compound, value - scalar
					ref = checkVarExact(t, locals, -1, "m3", "m3", "map[main.astruct]int [{A: 1, B: 1}: 42, {A: 2, B: 2}: 43, ]", "map[main.astruct]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m3 := client.ExpectVariablesResponse(t)
						checkChildren(t, m3, "m3", 3) // each key-value represented by a single child
						checkVarExact(t, m3, 0, "len()", "len(m3)", "2", "int", noChildren)
						ref = checkVarRegex(t, m3, 1, `main\.astruct {A: 1, B: 1}`, `m3\[\(\*\(\*"main.astruct"\)\(0x[0-9a-f]+\)\)\]`, "42", "int", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m3kv0 := client.ExpectVariablesResponse(t)
							checkChildren(t, m3kv0, "m3[0]", 2)
							checkVarRegex(t, m3kv0, 0, "A", `\(*\(*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.A`, "1", "int", noChildren)
							validateEvaluateName(t, client, m3kv0, 0)
						}
						ref = checkVarRegex(t, m3, 2, `main\.astruct {A: 2, B: 2}`, `m3\[\(\*\(\*"main.astruct"\)\(0x[0-9a-f]+\)\)\]`, "43", "", hasChildren)
						if ref > 0 { // inspect another key from another key-value child
							client.VariablesRequest(ref)
							m3kv1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m3kv1, "m3[1]", 2)
							checkVarRegex(t, m3kv1, 1, "B", `\(*\(*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.B`, "2", "int", noChildren)
							validateEvaluateName(t, client, m3kv1, 1)
						}
					}
					// key - compound, value - compound
					ref = checkVarExact(t, locals, -1, "m4", "m4", "map[main.astruct]main.astruct [{A: 1, B: 1}: {A: 11, B: 11}, {A: 2, B: 2}: {A: 22, B: 22}, ]", "map[main.astruct]main.astruct", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m4 := client.ExpectVariablesResponse(t)
						checkChildren(t, m4, "m4", 5) // each key and value represented by a child, so double the key-value count
						checkVarExact(t, m4, 0, "len()", "len(m4)", "2", "int", noChildren)
						checkVarRegex(t, m4, 1, `\[key 0\]`, `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)`, `main\.astruct {A: 1, B: 1}`, `main\.astruct`, hasChildren)
						checkVarRegex(t, m4, 2, `\[val 0\]`, `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]`, `main\.astruct {A: 11, B: 11}`, `main\.astruct`, hasChildren)
						ref = checkVarRegex(t, m4, 3, `\[key 1\]`, `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)`, `main\.astruct {A: 2, B: 2}`, `main\.astruct`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m4Key1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m4Key1, "m4Key1", 2)
							checkVarRegex(t, m4Key1, 0, "A", `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.A`, "2", "int", noChildren)
							checkVarRegex(t, m4Key1, 1, "B", `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.B`, "2", "int", noChildren)
							validateEvaluateName(t, client, m4Key1, 0)
							validateEvaluateName(t, client, m4Key1, 1)
						}
						ref = checkVarRegex(t, m4, 4, `\[val 1\]`, `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]`, `main\.astruct {A: 22, B: 22}`, "main.astruct", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m4Val1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m4Val1, "m4Val1", 2)
							checkVarRegex(t, m4Val1, 0, "A", `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]\.A`, "22", "int", noChildren)
							checkVarRegex(t, m4Val1, 1, "B", `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]\.B`, "22", "int", noChildren)
							validateEvaluateName(t, client, m4Val1, 0)
							validateEvaluateName(t, client, m4Val1, 1)
						}
					}
					checkVarExact(t, locals, -1, "emptymap", "emptymap", "map[string]string []", "map[string]string", noChildren)
					// reflect.Kind == Ptr
					ref = checkVarExact(t, locals, -1, "pp1", "pp1", "**1", "**int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						pp1val := client.ExpectVariablesResponse(t)
						checkChildren(t, pp1val, "*pp1", 1)
						ref = checkVarExact(t, pp1val, 0, "", "(*pp1)", "*1", "*int", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							pp1valval := client.ExpectVariablesResponse(t)
							checkChildren(t, pp1valval, "*(*pp1)", 1)
							checkVarExact(t, pp1valval, 0, "", "(*(*pp1))", "1", "int", noChildren)
							validateEvaluateName(t, client, pp1valval, 0)
						}
					}
					// reflect.Kind == Slice
					ref = checkVarExact(t, locals, -1, "zsslice", "zsslice", "[]struct {} len: 3, cap: 3, [{},{},{}]", "[]struct {}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						zsslice := client.ExpectVariablesResponse(t)
						checkChildren(t, zsslice, "zsslice", 3)
						checkVarExact(t, zsslice, 2, "[2]", "zsslice[2]", "struct {} {}", "struct {}", noChildren)
						validateEvaluateName(t, client, zsslice, 2)
					}
					checkVarExact(t, locals, -1, "emptyslice", "emptyslice", "[]string len: 0, cap: 0, []", "[]string", noChildren)
					checkVarExact(t, locals, -1, "nilslice", "nilslice", "[]int len: 0, cap: 0, nil", "[]int", noChildren)
					// reflect.Kind == String
					checkVarExact(t, locals, -1, "longstr", "longstr", longstr, "string", noChildren)
					// reflect.Kind == Struct
					checkVarExact(t, locals, -1, "zsvar", "zsvar", "struct {} {}", "struct {}", noChildren)
					// reflect.Kind == UnsafePointer
					// TODO(polina): how do I test for unsafe.Pointer(nil)?
					checkVarRegex(t, locals, -1, "upnil", "upnil", `unsafe\.Pointer\(0x0\)`, "int", noChildren)
					checkVarRegex(t, locals, -1, "up1", "up1", `unsafe\.Pointer\(0x[0-9a-f]+\)`, "int", noChildren)

					// Test unreadable variable
					ref = checkVarRegex(t, locals, -1, "unread", "unread", `\*\(unreadable .+\)`, "int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						val := client.ExpectVariablesResponse(t)
						checkChildren(t, val, "*unread", 1)
						checkVarRegex(t, val, 0, "^$", `\(\*unread\)`, `\(unreadable .+\)`, "int", noChildren)
						validateEvaluateName(t, client, val, 0)
					}
				},
				disconnect: true,
			}})
	})
}

// TestScopesRequestsOptimized executes to a breakpoint and tests different
// that the name of the "Locals" scope is correctly annotated with
// a warning about debugging an optimized function.
func TestScopesRequestsOptimized(t *testing.T) {
	runTestBuildFlags(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at first breakpoint
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)

					startLineno := 66
					if runtime.GOOS == "windows" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 15) {
						// Go1.15 on windows inserts a NOP after the call to
						// runtime.Breakpoint and marks it same line as the
						// runtime.Breakpoint call, making this flaky, so skip the line check.
						startLineno = -1
					}

					checkStackFramesExact(t, stack, "main.foobar", startLineno, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals (warning: optimized function)", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)
				},
				disconnect: false,
			}, {
				// Stop at second breakpoint
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.barfoo", 27, 1000, 5, 5)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals (warning: optimized function)", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)
				},
				disconnect: false,
			}})
	},
		protest.EnableOptimization)
}

// TestVariablesLoading exposes test cases where variables might be partially or
// fully unloaded.
func TestVariablesLoading(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute:    func() {},
				disconnect: false,
			}, {
				execute: func() {
					// Change default config values to trigger certain unloaded corner cases
					saveDefaultConfig := DefaultLoadConfig
					DefaultLoadConfig.MaxStructFields = 5
					DefaultLoadConfig.MaxStringLen = 64
					defer func() {
						DefaultLoadConfig = saveDefaultConfig
					}()

					client.StackTraceRequest(1, 0, 0)
					client.ExpectStackTraceResponse(t)

					client.ScopesRequest(1000)
					client.ExpectScopesResponse(t)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// String partially missing based on LoadConfig.MaxStringLen
					// See also TestVariableLoadingOfLongStrings
					checkVarExact(t, locals, -1, "longstr", "longstr", longstrLoaded64, "string", noChildren)

					checkArrayChildren := func(t *testing.T, longarr *dap.VariablesResponse, parentName string, start int) {
						t.Helper()
						for i, child := range longarr.Body.Variables {
							idx := start + i
							if child.Name != fmt.Sprintf("[%d]", idx) || child.EvaluateName != fmt.Sprintf("%s[%d]", parentName, idx) {
								t.Errorf("Expected %s[%d] to have Name=\"[%d]\" EvaluateName=\"%s[%d]\", got %#v", parentName, idx, idx, parentName, idx, child)
							}
						}
					}

					// Array not fully loaded based on LoadConfig.MaxArrayValues.
					// Expect to be able to load array by paging.
					ref := checkVarExactIndexed(t, locals, -1, "longarr", "longarr", "[100]int [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...+36 more]", "[100]int", hasChildren, 100, 0)
					if ref > 0 {
						client.VariablesRequest(ref)
						longarr := client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longarr", 64)
						checkArrayChildren(t, longarr, "longarr", 0)

						client.IndexedVariablesRequest(ref, 0, 100)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longarr", 100)
						checkArrayChildren(t, longarr, "longarr", 0)

						client.IndexedVariablesRequest(ref, 50, 50)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longarr", 50)
						checkArrayChildren(t, longarr, "longarr", 50)
					}

					// Slice not fully loaded based on LoadConfig.MaxArrayValues.
					// Expect to be able to load slice by paging.
					ref = checkVarExactIndexed(t, locals, -1, "longslice", "longslice", "[]int len: 100, cap: 100, [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...+36 more]", "[]int", hasChildren, 100, 0)
					if ref > 0 {
						client.VariablesRequest(ref)
						longarr := client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longslice", 64)
						checkArrayChildren(t, longarr, "longslice", 0)

						client.IndexedVariablesRequest(ref, 0, 100)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longslice", 100)
						checkArrayChildren(t, longarr, "longslice", 0)

						client.IndexedVariablesRequest(ref, 50, 50)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longslice", 50)
						checkArrayChildren(t, longarr, "longslice", 50)
					}

					// Map not fully loaded based on LoadConfig.MaxArrayValues
					// Expect to be able to load map by paging.
					ref = checkVarRegexIndexed(t, locals, -1, "m1", "m1", `map\[string\]main\.astruct \[.+\.\.\.`, `map\[string\]main\.astruct`, hasChildren, 66, 1)
					if ref > 0 {
						client.VariablesRequest(ref)
						m1 := client.ExpectVariablesResponse(t)
						checkChildren(t, m1, "m1", 65)

						client.IndexedVariablesRequest(ref, 0, 66)
						m1 = client.ExpectVariablesResponse(t)
						checkChildren(t, m1, "m1", 66)

						client.IndexedVariablesRequest(ref, 0, 33)
						m1part1 := client.ExpectVariablesResponse(t)
						checkChildren(t, m1part1, "m1", 33)

						client.IndexedVariablesRequest(ref, 33, 33)
						m1part2 := client.ExpectVariablesResponse(t)
						checkChildren(t, m1part2, "m1", 33)

						if len(m1part1.Body.Variables)+len(m1part2.Body.Variables) == len(m1.Body.Variables) {
							for i, got := range m1part1.Body.Variables {
								want := m1.Body.Variables[i]
								if got.Name != want.Name || got.Value != want.Value {
									t.Errorf("got %#v, want Name=%q Value=%q", got, want.Name, want.Value)
								}
							}
							for i, got := range m1part2.Body.Variables {
								want := m1.Body.Variables[i+len(m1part1.Body.Variables)]
								if got.Name != want.Name || got.Value != want.Value {
									t.Errorf("got %#v, want Name=%q Value=%q", got, want.Name, want.Value)
								}
							}
						}
						client.NamedVariablesRequest(ref)
						named := client.ExpectVariablesResponse(t)
						checkChildren(t, named, "m1", 1)
						checkVarExact(t, named, 0, "len()", "len(m1)", "66", "int", noChildren)
					}

					// Struct partially missing based on LoadConfig.MaxStructFields
					ref = checkVarExact(t, locals, -1, "sd", "sd", "(loaded 5/6) main.D {u1: 0, u2: 0, u3: 0, u4: 0, u5: 0,...+1 more}", "main.D", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						sd := client.ExpectVariablesResponse(t)
						checkChildren(t, sd, "sd", 5)
					}

					// Fully missing struct auto-loaded when reaching LoadConfig.MaxVariableRecurse (also tests evaluateName corner case)
					ref = checkVarRegex(t, locals, -1, "c1", "c1", `main\.cstruct {pb: \*main\.bstruct {a: \(\*main\.astruct\)\(0x[0-9a-f]+\)}, sa: []\*main\.astruct len: 3, cap: 3, [\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main.astruct\)\(0x[0-9a-f]+\)]}`, `main\.cstruct`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						c1 := client.ExpectVariablesResponse(t)
						checkChildren(t, c1, "c1", 2)
						ref = checkVarRegex(t, c1, 1, "sa", `c1\.sa`, `\[\]\*main\.astruct len: 3, cap: 3, \[\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main\.astruct\)\(0x[0-9a-f]+\)\]`, `\[\]\*main\.astruct`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							c1sa := client.ExpectVariablesResponse(t)
							checkChildren(t, c1sa, "c1.sa", 3)
							ref = checkVarRegex(t, c1sa, 0, `\[0\]`, `c1\.sa\[0\]`, `\*\(\*main\.astruct\)\(0x[0-9a-f]+\)`, `\*main\.astruct`, hasChildren)
							if ref > 0 {
								// Auto-loading of fully missing struc children happens here
								client.VariablesRequest(ref)
								c1sa0 := client.ExpectVariablesResponse(t)
								checkChildren(t, c1sa0, "c1.sa[0]", 1)
								// TODO(polina): there should be children here once we support auto loading
								checkVarExact(t, c1sa0, 0, "", "(*c1.sa[0])", "main.astruct {A: 1, B: 2}", "main.astruct", hasChildren)
							}
						}
					}

					// Fully missing struct auto-loaded when hitting LoadConfig.MaxVariableRecurse (also tests evaluteName corner case)
					ref = checkVarRegex(t, locals, -1, "aas", "aas", `\[\]main\.a len: 1, cap: 1, \[{aas: \[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]}\]`, `\[\]main\.a`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						aas := client.ExpectVariablesResponse(t)
						checkChildren(t, aas, "aas", 1)
						ref = checkVarRegex(t, aas, 0, "[0]", `aas\[0\]`, `main\.a {aas: \[\]main.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]}`, `main\.a`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							aas0 := client.ExpectVariablesResponse(t)
							checkChildren(t, aas0, "aas[0]", 1)
							ref = checkVarRegex(t, aas0, 0, "aas", `aas\[0\]\.aas`, `\[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]`, `\[\]main\.a`, hasChildren)
							if ref > 0 {
								// Auto-loading of fully missing struct children happens here
								client.VariablesRequest(ref)
								aas0aas := client.ExpectVariablesResponse(t)
								checkChildren(t, aas0aas, "aas[0].aas", 1)
								// TODO(polina): there should be a child here once we support auto loading - test for "aas[0].aas[0].aas"
								ref = checkVarRegex(t, aas0aas, 0, "[0]", `aas\[0\]\.aas\[0\]`, `main\.a {aas: \[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]}`, "main.a", hasChildren)
								if ref > 0 {
									client.VariablesRequest(ref)
									aas0aas0 := client.ExpectVariablesResponse(t)
									checkChildren(t, aas0aas, "aas[0].aas[0]", 1)
									checkVarRegex(t, aas0aas0, 0, "aas", `aas\[0\]\.aas\[0\]\.aas`, `\[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]`, `\[\]main\.a`, hasChildren)
								}
							}
						}
					}

					// Fully missing map auto-loaded when hitting LoadConfig.MaxVariableRecurse (also tests evaluateName corner case)
					ref = checkVarExact(t, locals, -1, "tm", "tm", "main.truncatedMap {v: []map[string]main.astruct len: 1, cap: 1, [[...]]}", "main.truncatedMap", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						tm := client.ExpectVariablesResponse(t)
						checkChildren(t, tm, "tm", 1)
						ref = checkVarExact(t, tm, 0, "v", "tm.v", "[]map[string]main.astruct len: 1, cap: 1, [[...]]", "[]map[string]main.astruct", hasChildren)
						if ref > 0 {
							// Auto-loading of fully missing map chidlren happens here, but they get trancated at MaxArrayValuess
							client.VariablesRequest(ref)
							tmV := client.ExpectVariablesResponse(t)
							checkChildren(t, tmV, "tm.v", 1)
							ref = checkVarRegex(t, tmV, 0, `\[0\]`, `tm\.v\[0\]`, `map\[string\]main\.astruct \[.+\.\.\.`, `map\[string\]main\.astruct`, hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								tmV0 := client.ExpectVariablesResponse(t)
								checkChildren(t, tmV0, "tm.v[0]", 65)
							}
						}
					}

					// Auto-loading works with call return variables as well
					protest.MustSupportFunctionCalls(t, testBackend)
					client.EvaluateRequest("call rettm()", 1000, "repl")
					got := client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, "main.truncatedMap {v: []map[string]main.astruct len: 1, cap: 1, [[...]]}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rv := client.ExpectVariablesResponse(t)
						checkChildren(t, rv, "rv", 1)
						ref = checkVarExact(t, rv, 0, "~r0", "", "main.truncatedMap {v: []map[string]main.astruct len: 1, cap: 1, [[...]]}", "main.truncatedMap", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							tm := client.ExpectVariablesResponse(t)
							checkChildren(t, tm, "tm", 1)
							ref = checkVarExact(t, tm, 0, "v", "", "[]map[string]main.astruct len: 1, cap: 1, [[...]]", "[]map[string]main.astruct", hasChildren)
							if ref > 0 {
								// Auto-loading of fully missing map chidlren happens here, but they get trancated at MaxArrayValuess
								client.VariablesRequest(ref)
								tmV := client.ExpectVariablesResponse(t)
								checkChildren(t, tmV, "tm.v", 1)
								// TODO(polina): this evaluate name is not usable - it should be empty
								ref = checkVarRegex(t, tmV, 0, `\[0\]`, `\[0\]`, `map\[string\]main\.astruct \[.+\.\.\.`, `map\[string\]main\.astruct`, hasChildren)
								if ref > 0 {
									client.VariablesRequest(ref)
									tmV0 := client.ExpectVariablesResponse(t)
									checkChildren(t, tmV0, "tm.v[0]", 65)
								}
							}
						}
					}

					// TODO(polina): need fully missing array/slice test case

					// Zero slices, structs and maps are not treated as fully missing
					// See zsvar, zsslice,, emptyslice, emptymap, a0
				},
				disconnect: true,
			}})
	})
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					DefaultLoadConfig.FollowPointers = false
					defer func() { DefaultLoadConfig.FollowPointers = true }()

					client.StackTraceRequest(1, 0, 0)
					client.ExpectStackTraceResponse(t)

					var loadvars = func(frame int) {
						client.ScopesRequest(frame)
						scopes := client.ExpectScopesResponse(t)
						localsRef := 0
						for _, s := range scopes.Body.Scopes {
							if s.Name == "Locals" {
								localsRef = s.VariablesReference
							}
						}

						client.VariablesRequest(localsRef)
						locals := client.ExpectVariablesResponse(t)

						// Interface auto-loaded when hitting LoadConfig.MaxVariableRecurse=1

						ref := checkVarRegex(t, locals, -1, "ni", "ni", `\[\]interface {} len: 1, cap: 1, \[\[\]interface {} len: 1, cap: 1, \[\*\(\*interface {}\)\(0x[0-9a-f]+\)\]\]`, `\[\]interface {}`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							ni := client.ExpectVariablesResponse(t)
							ref = checkVarRegex(t, ni, 0, `\[0\]`, `ni\[0\]`, `interface \{\}\(\[\]interface \{\}\) \[\*\(\*interface \{\}\)\(0x[0-9a-f]+\)\]`, "interface {}", hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								niI1 := client.ExpectVariablesResponse(t)
								ref = checkVarRegex(t, niI1, 0, "data", `ni\[0\]\.\(data\)`, `\[\]interface {} len: 1, cap: 1, \[\*\(\*interface {}\)\(0x[0-9a-f]+\)`, `\[\]interface {}`, hasChildren)
								if ref > 0 {
									// Auto-loading happens here
									client.VariablesRequest(ref)
									niI1Data := client.ExpectVariablesResponse(t)
									ref = checkVarExact(t, niI1Data, 0, "[0]", "ni[0].(data)[0]", "interface {}(int) 123", "interface {}", hasChildren)
									if ref > 0 {
										client.VariablesRequest(ref)
										niI1DataI2 := client.ExpectVariablesResponse(t)
										checkVarExact(t, niI1DataI2, 0, "data", "ni[0].(data)[0].(data)", "123", "int", noChildren)
									}
								}
							}
						}

						// Pointer values loaded even with LoadConfig.FollowPointers=false
						checkVarExact(t, locals, -1, "a7", "a7", "*main.FooBar {Baz: 5, Bur: \"strum\"}", "*main.FooBar", hasChildren)

						// Auto-loading works on results of evaluate expressions as well
						client.EvaluateRequest("a7", frame, "repl")
						checkEval(t, client.ExpectEvaluateResponse(t), "*main.FooBar {Baz: 5, Bur: \"strum\"}", hasChildren)

						client.EvaluateRequest("&a7", frame, "repl")
						pa7 := client.ExpectEvaluateResponse(t)
						ref = checkEvalRegex(t, pa7, `\*\(\*main\.FooBar\)\(0x[0-9a-f]+\)`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a7 := client.ExpectVariablesResponse(t)
							checkVarExact(t, a7, 0, "a7", "(*(&a7))", "*main.FooBar {Baz: 5, Bur: \"strum\"}", "*main.FooBar", hasChildren)
						}
					}

					// Frame-independent loading expressions allow us to auto-load
					// variables in any frame, not just topmost.
					loadvars(1000 /*first topmost frame*/)
					// step into another function
					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.barfoo", 24)
					loadvars(1001 /*second frame here is same as topmost above*/)
				},
				disconnect: true,
			}})
	})
}

// TestVariablesMetadata exposes test cases where variables contain metadata that
// can be accessed by requesting named variables.
func TestVariablesMetadata(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute:    func() {},
				disconnect: false,
			}, {
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					checkNamedChildren := func(ref int, name, typeStr string, vals []string, evaluate bool) {
						// byteslice, request named variables
						client.NamedVariablesRequest(ref)
						named := client.ExpectVariablesResponse(t)
						checkChildren(t, named, name, 1)
						checkVarExact(t, named, 0, "string()", "", "\"tèst\"", "string", false)

						client.VariablesRequest(ref)
						all := client.ExpectVariablesResponse(t)
						checkChildren(t, all, name, len(vals)+1)
						checkVarExact(t, all, 0, "string()", "", "\"tèst\"", "string", false)
						for i, v := range vals {
							idx := fmt.Sprintf("[%d]", i)
							evalName := fmt.Sprintf("%s[%d]", name, i)
							if evaluate {
								evalName = fmt.Sprintf("(%s)[%d]", name, i)
							}
							checkVarExact(t, all, i+1, idx, evalName, v, typeStr, false)
						}
					}

					bytes := []string{"116 = 0x74", "195 = 0xc3", "168 = 0xa8", "115 = 0x73", "116 = 0x74"}
					runes := []string{"116", "232", "115", "116"}

					// byteslice
					ref := checkVarExactIndexed(t, locals, -1, "byteslice", "byteslice", "[]uint8 len: 5, cap: 5, [116,195,168,115,116]", "[]uint8", true, 5, 1)
					checkNamedChildren(ref, "byteslice", "uint8", bytes, false)

					client.EvaluateRequest("byteslice", 0, "")
					got := client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[]uint8 len: 5, cap: 5, [116,195,168,115,116]", hasChildren, 5, 1)
					checkNamedChildren(ref, "byteslice", "uint8", bytes, true)

					// runeslice
					ref = checkVarExactIndexed(t, locals, -1, "runeslice", "runeslice", "[]int32 len: 4, cap: 4, [116,232,115,116]", "[]int32", true, 4, 1)
					checkNamedChildren(ref, "runeslice", "int32", runes, false)

					client.EvaluateRequest("runeslice", 0, "repl")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[]int32 len: 4, cap: 4, [116,232,115,116]", hasChildren, 4, 1)
					checkNamedChildren(ref, "runeslice", "int32", runes, true)

					// bytearray
					ref = checkVarExactIndexed(t, locals, -1, "bytearray", "bytearray", "[5]uint8 [116,195,168,115,116]", "[5]uint8", true, 5, 1)
					checkNamedChildren(ref, "bytearray", "uint8", bytes, false)

					client.EvaluateRequest("bytearray", 0, "hover")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[5]uint8 [116,195,168,115,116]", hasChildren, 5, 1)
					checkNamedChildren(ref, "bytearray", "uint8", bytes, true)

					// runearray
					ref = checkVarExactIndexed(t, locals, -1, "runearray", "runearray", "[4]int32 [116,232,115,116]", "[4]int32", true, 4, 1)
					checkNamedChildren(ref, "runearray", "int32", runes, false)

					client.EvaluateRequest("runearray", 0, "watch")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[4]int32 [116,232,115,116]", hasChildren, 4, 1)
					checkNamedChildren(ref, "runearray", "int32", runes, true)

					// string feature is not available with user-defined byte types
					ref = checkVarExactIndexed(t, locals, -1, "bytestypeslice", "bytestypeslice", "[]main.Byte len: 5, cap: 5, [116,195,168,115,116]", "[]main.Byte", true, 5, 1)
					client.NamedVariablesRequest(ref)
					namedchildren := client.ExpectVariablesResponse(t)
					checkChildren(t, namedchildren, "bytestypeslice as string", 0)
					ref = checkVarExactIndexed(t, locals, -1, "bytetypearray", "bytetypearray", "[5]main.Byte [116,195,168,115,116]", "[5]main.Byte", true, 5, 1)
					client.NamedVariablesRequest(ref)
					namedchildren = client.ExpectVariablesResponse(t)
					checkChildren(t, namedchildren, "bytetypearray as string", 0)
				},
				disconnect: true,
			}})
	})
}

// TestGlobalScopeAndVariables launches the program with showGlobalVariables
// arg set, executes to a breakpoint in the main package and tests that global
// package main variables got loaded. It then steps into a function
// in another package and tests that globals scope got updated to those vars.
func TestGlobalScopeAndVariables(t *testing.T) {
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true, "showRegisters": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 36
				execute: func() {
					if runtime.GOARCH == "386" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 18) {
						client.StepInRequest(1)
						client.ExpectStepInResponse(t)
						client.ExpectStoppedEvent(t)
					}
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 36, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)
					checkScope(t, scopes, 2, "Registers", globalsScope+1)

					client.VariablesRequest(globalsScope)
					client.ExpectVariablesResponse(t)
					// The program has no user-defined globals.
					// Depending on the Go version, there might
					// be some runtime globals (e.g. main..inittask)
					// so testing for the total number is too fragile.

					// Step into pkg.AnotherMethod()
					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					client.ExpectStoppedEvent(t)

					client.StackTraceRequest(1, 0, 20)
					stack = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "", 13, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes = client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package github.com/undoio/delve/_fixtures/internal/dir0/pkg)", globalsScope)

					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)
					checkChildren(t, globals, "Globals", 1)
					ref := checkVarExact(t, globals, 0, "SomeVar", "github.com/undoio/delve/_fixtures/internal/dir0/pkg.SomeVar", "github.com/undoio/delve/_fixtures/internal/dir0/pkg.SomeType {X: 0}", "github.com/undoio/delve/_fixtures/internal/dir0/pkg.SomeType", hasChildren)

					if ref > 0 {
						client.VariablesRequest(ref)
						somevar := client.ExpectVariablesResponse(t)
						checkChildren(t, somevar, "SomeVar", 1)
						// TODO(polina): unlike main.p, this prefix won't work
						checkVarExact(t, somevar, 0, "X", "github.com/undoio/delve/_fixtures/internal/dir0/pkg.SomeVar.X", "0", "float64", noChildren)
					}
				},
				disconnect: false,
			}})
	})
}

// TestRegisterScopeAndVariables launches the program with showRegisters
// arg set, executes to a breakpoint in the main package and tests that the registers
// got loaded. It then steps into a function in another package and tests that
// the registers were updated by checking PC.
func TestRegistersScopeAndVariables(t *testing.T) {
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showRegisters": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 36
				execute: func() {
					if runtime.GOARCH == "386" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 18) {
						client.StepInRequest(1)
						client.ExpectStepInResponse(t)
						client.ExpectStoppedEvent(t)
					}

					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 36, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					registersScope := localsScope + 1
					checkScope(t, scopes, 1, "Registers", registersScope)

					// Check that instructionPointer points to the InstructionPointerReference.
					pc, err := getPC(t, client, 1)
					if err != nil {
						t.Error(pc)
					}

					client.VariablesRequest(registersScope)
					vr := client.ExpectVariablesResponse(t)
					if len(vr.Body.Variables) == 0 {
						t.Fatal("no registers returned")
					}
					idx := findPcReg(vr.Body.Variables)
					if idx < 0 {
						t.Fatalf("got %#v, want a reg with instruction pointer", vr.Body.Variables)
					}
					pcReg := vr.Body.Variables[idx]
					gotPc, err := strconv.ParseUint(pcReg.Value, 0, 64)
					if err != nil {
						t.Error(err)
					}
					name := strings.TrimSpace(pcReg.Name)
					if gotPc != pc || pcReg.EvaluateName != fmt.Sprintf("_%s", strings.ToUpper(name)) {
						t.Errorf("got %#v,\nwant Name=%s Value=%#x EvaluateName=%q", pcReg, name, pc, fmt.Sprintf("_%s", strings.ToUpper(name)))
					}

					// The program has no user-defined globals.
					// Depending on the Go version, there might
					// be some runtime globals (e.g. main..inittask)
					// so testing for the total number is too fragile.

					// Step into pkg.AnotherMethod()
					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					client.ExpectStoppedEvent(t)

					client.StackTraceRequest(1, 0, 20)
					stack = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "", 13, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes = client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Registers", registersScope)

					// Check that rip points to the InstructionPointerReference.
					pc, err = getPC(t, client, 1)
					if err != nil {
						t.Error(pc)
					}
					client.VariablesRequest(registersScope)
					vr = client.ExpectVariablesResponse(t)
					if len(vr.Body.Variables) == 0 {
						t.Fatal("no registers returned")
					}

					idx = findPcReg(vr.Body.Variables)
					if idx < 0 {
						t.Fatalf("got %#v, want a reg with instruction pointer", vr.Body.Variables)
					}
					pcReg = vr.Body.Variables[idx]
					gotPc, err = strconv.ParseUint(pcReg.Value, 0, 64)
					if err != nil {
						t.Error(err)
					}

					if gotPc != pc || pcReg.EvaluateName != fmt.Sprintf("_%s", strings.ToUpper(name)) {
						t.Errorf("got %#v,\nwant Name=%s Value=%#x EvaluateName=%q", pcReg, name, pc, fmt.Sprintf("_%s", strings.ToUpper(name)))
					}
				},
				disconnect: false,
			}})
	})
}

func findPcReg(regs []dap.Variable) int {
	for i, reg := range regs {
		if isPcReg(reg) {
			return i
		}
	}
	return -1
}

func isPcReg(reg dap.Variable) bool {
	pcRegNames := []string{"rip", "pc", "eip"}
	for _, name := range pcRegNames {
		if name == strings.TrimSpace(reg.Name) {
			return true
		}
	}
	return false
}

// TestShadowedVariables executes to a breakpoint and checks the shadowed
// variable is named correctly.
func TestShadowedVariables(t *testing.T) {
	runTest(t, "testshadow", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 13
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 13, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					checkVarExact(t, locals, 0, "(a)", "a", "0", "int", !hasChildren)
					checkVarExact(t, locals, 1, "a", "a", "1", "int", !hasChildren)

					// Check that the non-shadowed of "a" is returned from evaluate request.
					validateEvaluateName(t, client, locals, 1)
				},
				disconnect: false,
			}})
	})
}

// Tests that 'stackTraceDepth' from LaunchRequest is parsed and passed to
// stacktrace requests handlers.
func TestLaunchRequestWithStackTraceDepth(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		var stResp *dap.StackTraceResponse
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "stackTraceDepth": 1,
				})
			},
			// Set breakpoints
			fixture.Source, []int{8},
			[]onBreakpoint{{ // Stop at line 8
				execute: func() {
					client.StackTraceRequest(1, 0, 0)
					stResp = client.ExpectStackTraceResponse(t)
					checkStackFramesHasMore(t, stResp, "main.Increment", 8, 1000, 1 /*returned*/, 2 /*available*/)
				},
				disconnect: false,
			}})
	})
}

type Breakpoint struct {
	line      int
	path      string
	verified  bool
	msgPrefix string
}

func expectSetBreakpointsResponse(t *testing.T, client *daptest.Client, bps []Breakpoint) {
	t.Helper()
	checkSetBreakpointsResponse(t, bps, client.ExpectSetBreakpointsResponse(t))
}

func checkSetBreakpointsResponse(t *testing.T, bps []Breakpoint, got *dap.SetBreakpointsResponse) {
	t.Helper()
	checkBreakpoints(t, bps, got.Body.Breakpoints)
}

func checkBreakpoints(t *testing.T, bps []Breakpoint, breakpoints []dap.Breakpoint) {
	t.Helper()
	if len(breakpoints) != len(bps) {
		t.Errorf("got %#v,\nwant len(Breakpoints)=%d", breakpoints, len(bps))
		return
	}
	for i, bp := range breakpoints {
		if bps[i].line < 0 && !bps[i].verified {
			if bp.Verified != bps[i].verified || !stringContainsCaseInsensitive(bp.Message, bps[i].msgPrefix) {
				t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
			}
			continue
		}
		if bp.Line != bps[i].line || bp.Verified != bps[i].verified || bp.Source.Path != bps[i].path ||
			!strings.HasPrefix(bp.Message, bps[i].msgPrefix) {
			t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
		}
	}
}

// TestSetBreakpoint executes to a breakpoint and tests different
// configurations of setBreakpoint requests.
func TestSetBreakpoint(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)

					// Set two breakpoints at the next two lines in main
					client.SetBreakpointsRequest(fixture.Source, []int{17, 18})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{17, fixture.Source, true, ""}, {18, fixture.Source, true, ""}})

					// Clear 17, reset 18
					client.SetBreakpointsRequest(fixture.Source, []int{18})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{18, fixture.Source, true, ""}})

					// Skip 17, continue to 18
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 18)

					// Set another breakpoint inside the loop in loop(), twice to trigger error
					client.SetBreakpointsRequest(fixture.Source, []int{8, 8})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}, {-1, "", false, "breakpoint already exists"}})

					// Continue into the loop
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "0", "int", noChildren) // i == 0

					// Edit the breakpoint to add a condition
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{8}, map[int]string{8: "i == 3"}, nil, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})

					// Continue until condition is hit
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "3", "int", noChildren) // i == 3

					// Edit the breakpoint to remove a condition
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{8}, map[int]string{8: ""}, nil, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})

					// Continue for one more loop iteration
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "4", "int", noChildren) // i == 4

					// Set at a line without a statement
					client.SetBreakpointsRequest(fixture.Source, []int{1000})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{-1, "", false, "could not find statement"}}) // all cleared, none set
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

// TestSetInstructionBreakpoint executes to a breakpoint and tests different
// configurations of setInstructionBreakpoint requests.
func TestSetInstructionBreakpoint(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)

					// Set two breakpoints in the loop
					client.SetBreakpointsRequest(fixture.Source, []int{8, 9})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}, {9, fixture.Source, true, ""}})

					// Continue to the two breakpoints and get the instructionPointerReference.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)

					client.StackTraceRequest(1, 0, 1)
					st := client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}
					pc8 := st.Body.StackFrames[0].InstructionPointerReference

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					client.StackTraceRequest(1, 0, 1)
					st = client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}
					pc9 := st.Body.StackFrames[0].InstructionPointerReference

					// Clear the source breakpoints.
					// TODO(suzmue): there is an existing issue that breakpoints with identical locations
					// from different setBreakpoints, setFunctionBreakpoints, setInstructionBreakpoints
					// requests will prevent subsequent ones from being set.
					client.SetBreakpointsRequest(fixture.Source, []int{})
					expectSetBreakpointsResponse(t, client, []Breakpoint{})

					// Set the breakpoints using the instruction pointer references.
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc8}, {InstructionReference: pc9}})
					bps := client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 8, path: fixture.Source, verified: true}, {line: 9, path: fixture.Source, verified: true}}, bps)

					// Continue to the two breakpoints and get the instructionPointerReference.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					// Remove the breakpoint on line 8 and continue.
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc9}})
					bps = client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 9, path: fixture.Source, verified: true}}, bps)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					// Set two breakpoints and expect an error on the second one.
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc8}, {InstructionReference: pc8}})
					bps = client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 8, path: fixture.Source, verified: true}, {line: -1, path: "", verified: false, msgPrefix: "breakpoint already exists"}}, bps)

					// Add a condition
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc8, Condition: "i == 100"}})
					bps = client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 8, path: fixture.Source, verified: true}}, bps)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "100", "int", noChildren) // i == 100
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

func TestPauseAtStop(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)

					client.SetBreakpointsRequest(fixture.Source, []int{6, 8})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{6, fixture.Source, true, ""}, {8, fixture.Source, true, ""}})

					// Send a pause request while stopped on a cleared breakpoint.
					client.PauseRequest(1)
					client.ExpectPauseResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 6)

					// Send a pause request while stopped on a breakpoint.
					client.PauseRequest(1)
					client.ExpectPauseResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" {
						t.Errorf("got %#v, expected breakpoint", se)
					}
					checkStop(t, client, 1, "main.loop", 8)

					// Send a pause request while stopped after stepping.
					client.NextRequest(1)
					client.ExpectNextResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					client.PauseRequest(1)
					client.ExpectPauseResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

func checkHitBreakpointIds(t *testing.T, se *dap.StoppedEvent, reason string, id int) {
	if se.Body.ThreadId != 1 || se.Body.Reason != reason || len(se.Body.HitBreakpointIds) != 1 || se.Body.HitBreakpointIds[0] != id {
		t.Errorf("got %#v, want Reason=%q, ThreadId=1, HitBreakpointIds=[]int{%d}", se, reason, id)
	}
}

// TestHitBreakpointIds executes to a breakpoint and tests that
// the breakpoint ids in the stopped event are correct.
func TestHitBreakpointIds(t *testing.T) {
	runTest(t, "locationsprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{30}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 30)

					// Set two source breakpoints and two function breakpoints.
					client.SetBreakpointsRequest(fixture.Source, []int{23, 33})
					sourceBps := client.ExpectSetBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 23, path: fixture.Source, verified: true}, {line: 33, path: fixture.Source, verified: true}}, sourceBps)

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "anotherFunction"},
						{Name: "anotherFunction:1"},
					})
					functionBps := client.ExpectSetFunctionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 26, path: fixture.Source, verified: true}, {line: 27, path: fixture.Source, verified: true}}, functionBps)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se := client.ExpectStoppedEvent(t)
					checkHitBreakpointIds(t, se, "breakpoint", sourceBps[1].Id)
					checkStop(t, client, 1, "main.main", 33)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					checkHitBreakpointIds(t, se, "breakpoint", sourceBps[0].Id)
					checkStop(t, client, 1, "main.(*SomeType).SomeFunction", 23)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					checkHitBreakpointIds(t, se, "function breakpoint", functionBps[0].Id)
					checkStop(t, client, 1, "main.anotherFunction", 26)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)

					checkHitBreakpointIds(t, se, "function breakpoint", functionBps[1].Id)

					checkStop(t, client, 1, "main.anotherFunction", 27)
				},
				disconnect: true,
			}})
	})
}

func stringContainsCaseInsensitive(got, want string) bool {
	return strings.Contains(strings.ToLower(got), strings.ToLower(want))
}

// TestSetFunctionBreakpoints is inspired by service/test.TestClientServer_FindLocations.
func TestSetFunctionBreakpoints(t *testing.T) {
	runTest(t, "locationsprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{30}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 30)

					type Breakpoint struct {
						line       int
						sourceName string
						verified   bool
						errMsg     string
					}
					expectSetFunctionBreakpointsResponse := func(bps []Breakpoint) {
						t.Helper()
						got := client.ExpectSetFunctionBreakpointsResponse(t)
						if len(got.Body.Breakpoints) != len(bps) {
							t.Errorf("got %#v,\nwant len(Breakpoints)=%d", got, len(bps))
							return
						}
						for i, bp := range got.Body.Breakpoints {
							if bps[i].line < 0 && !bps[i].verified {
								if bp.Verified != bps[i].verified || !stringContainsCaseInsensitive(bp.Message, bps[i].errMsg) {
									t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
								}
								continue
							}
							// Some function breakpoints may be in packages that have been imported and we do not control, so
							// we do not always want to check breakpoint lines.
							if (bps[i].line >= 0 && bp.Line != bps[i].line) || bp.Verified != bps[i].verified || bp.Source.Name != bps[i].sourceName {
								t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
							}
						}
					}

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{26, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{26, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "(*SomeType).String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.SomeType.String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.(*SomeType).String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					// Test line offsets
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.anotherFunction:1"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{27, filepath.Base(fixture.Source), true, ""}})

					// Test function names in imported package.
					// Issue #275
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "io/ioutil.ReadFile"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "ioutil.go", true, ""}})

					// Issue #296
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "/io/ioutil.ReadFile"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "ioutil.go", true, ""}})
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "ioutil.ReadFile"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "ioutil.go", true, ""}})

					// Function Breakpoint name also accepts breakpoints that are specified as file:line.
					// TODO(suzmue): We could return an error, but it probably is not necessary since breakpoints,
					// and function breakpoints come in with different requests.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf("%s:14", fixture.Source)},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf("%s:14", filepath.Base(fixture.Source))},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					// Expect error for ambiguous function name.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "Location \"String\" ambiguous"}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "Location \"main.String\" ambiguous"}})

					// Expect error for function that does not exist.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "fakeFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "location \"fakeFunction\" not found"}})

					// Expect error for negative line number.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.anotherFunction:-1"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "line offset negative or not a number"}})

					// Expect error when function name is regex.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: `/^.*String.*$/`},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "breakpoint name \"/^.*String.*$/\" could not be parsed as a function"}})

					// Expect error when function name is an offset.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "+1"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, "breakpoint name \"+1\" could not be parsed as a function"}})

					// Expect error when function name is a line number.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "14"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, "breakpoint name \"14\" could not be parsed as a function"}})

					// Expect error when function name is an address.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "*b"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, "breakpoint name \"*b\" could not be parsed as a function"}})

					// Expect error when function name is a relative path.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf(".%s%s:14", string(filepath.Separator), filepath.Base(fixture.Source))},
					})
					// This relative path could also be caught by the parser, so we should not match the error message.
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, ""}})
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf("..%s%s:14", string(filepath.Separator), filepath.Base(fixture.Source))},
					})
					// This relative path could also be caught by the parser, so we should not match the error message.
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, ""}})

					// Test multiple function breakpoints.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"}, {Name: "anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}, {26, filepath.Base(fixture.Source), true, ""}})

					// Test multiple breakpoints to the same location.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"}, {Name: "(*SomeType).String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}, {-1, "", false, "breakpoint exists"}})

					// Set two breakpoints at SomeType.String and SomeType.SomeFunction.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"}, {Name: "SomeType.SomeFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}, {22, filepath.Base(fixture.Source), true, ""}})

					// Clear SomeType.String, reset SomeType.SomeFunction (SomeType.String is called before SomeType.SomeFunction).
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.SomeFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{22, filepath.Base(fixture.Source), true, ""}})

					// Expect the next breakpoint to be at SomeType.SomeFunction.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "function breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got %#v, want Reason=\"function breakpoint\", ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.(*SomeType).SomeFunction", 22)

					// Set a breakpoint at the next line in the program.
					client.SetBreakpointsRequest(fixture.Source, []int{23})
					got := client.ExpectSetBreakpointsResponse(t)
					if len(got.Body.Breakpoints) != 1 {
						t.Errorf("got %#v,\nwant len(Breakpoints)=%d", got, 1)
						return
					}
					bp := got.Body.Breakpoints[0]
					if bp.Line != 23 || bp.Verified != true || bp.Source.Path != fixture.Source {
						t.Errorf("got breakpoints[0] = %#v, \nwant Line=23 Verified=true Source.Path=%q", bp, fixture.Source)
					}

					// Set a function breakpoint, this should not clear the breakpoint that was set in the previous setBreakpoints request.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{26, filepath.Base(fixture.Source), true, ""}})

					// Expect the next breakpoint to be at line 23.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got %#v, want Reason=\"breakpoint\", ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.(*SomeType).SomeFunction", 23)

					// Set a breakpoint, this should not clear the breakpoint that was set in the previous setFunctionBreakpoints request.
					client.SetBreakpointsRequest(fixture.Source, []int{37})
					got = client.ExpectSetBreakpointsResponse(t)
					if len(got.Body.Breakpoints) != 1 {
						t.Errorf("got %#v,\nwant len(Breakpoints)=%d", got, 1)
						return
					}
					bp = got.Body.Breakpoints[0]
					if bp.Line != 37 || bp.Verified != true || bp.Source.Path != fixture.Source {
						t.Errorf("got breakpoints[0] = %#v, \nwant Line=23 Verified=true Source.Path=%q", bp, fixture.Source)
					}

					// Expect the next breakpoint to be at line anotherFunction.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "function breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got %#v, want Reason=\"function breakpoint\", ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.anotherFunction", 26)

				},
				disconnect: true,
			}})
	})
}

// TestLogPoints executes to a breakpoint and tests that log points
// send OutputEvents and do not halt program execution.
func TestLogPoints(t *testing.T) {
	runTest(t, "callme", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{23},
			[]onBreakpoint{{
				// Stop at line 23
				execute: func() {
					checkStop(t, client, 1, "main.main", 23)
					bps := []int{6, 25, 27, 16}
					logMessages := map[int]string{6: "{i*2}: in callme!", 16: "in callme2!"}
					client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					for i := 0; i < 5; i++ {
						se := client.ExpectStoppedEvent(t)
						if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
							t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
						}
						checkStop(t, client, 1, "main.main", 25)

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						checkLogMessage(t, client.ExpectOutputEvent(t), 1, fmt.Sprintf("%d: in callme!", i*2), fixture.Source, 6)
					}
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 27)

					client.NextRequest(1)
					client.ExpectNextResponse(t)

					checkLogMessage(t, client.ExpectOutputEvent(t), 1, "in callme2!", fixture.Source, 16)

					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "step" || se.Body.ThreadId != 1 {
						t.Errorf("got stopped event = %#v, \nwant Reason=\"step\" ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 28)
				},
				disconnect: true,
			}})
	})
}

func checkLogMessage(t *testing.T, oe *dap.OutputEvent, goid int, text, path string, line int) {
	t.Helper()
	prefix := "> [Go "
	if goid >= 0 {
		prefix += strconv.Itoa(goid) + "]"
	}
	if oe.Body.Category != "stdout" || !strings.HasPrefix(oe.Body.Output, prefix) || !strings.HasSuffix(oe.Body.Output, text+"\n") {
		t.Errorf("got output event = %#v, \nwant Category=\"stdout\" Output=\"%s: %s\\n\"", oe, prefix, text)
	}
	if oe.Body.Line != line || oe.Body.Source.Path != path {
		t.Errorf("got output event = %#v, \nwant Line=%d Source.Path=%s", oe, line, path)
	}
}

// TestHaltPreventsAutoResume tests that a pause request issued while processing
// log messages will result in a real stop.
func TestHaltPreventsAutoResume(t *testing.T) {
	runTest(t, "callme", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch", // Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{23},
			[]onBreakpoint{{
				execute: func() {
					savedResumeOnce := resumeOnceAndCheckStop
					defer func() {
						resumeOnceAndCheckStop = savedResumeOnce
					}()
					checkStop(t, client, 1, "main.main", 23)
					bps := []int{6, 25}
					logMessages := map[int]string{6: "in callme!"}
					client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
					client.ExpectSetBreakpointsResponse(t)

					for i := 0; i < 5; i++ {
						// Reset the handler to the default behavior.
						resumeOnceAndCheckStop = savedResumeOnce

						// Expect a pause request while stopped not to interrupt continue.
						client.PauseRequest(1)
						client.ExpectPauseResponse(t)

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						se := client.ExpectStoppedEvent(t)
						if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
							t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
						}
						checkStop(t, client, 1, "main.main", 25)

						pauseDoneChan := make(chan struct{}, 1)
						outputDoneChan := make(chan struct{}, 1)
						// Send a halt request when trying to resume the program after being
						// interrupted. This should allow the log message to be processed,
						// but keep the process from continuing beyond the line.
						resumeOnceAndCheckStop = func(s *Session, command string, allowNextStateChange chan struct{}) (*api.DebuggerState, error) {
							// This should trigger after the log message is sent, but before
							// execution is resumed.
							if command == api.DirectionCongruentContinue {
								go func() {
									<-outputDoneChan
									defer close(pauseDoneChan)
									client.PauseRequest(1)
									client.ExpectPauseResponse(t)
								}()
								// Wait for the pause to be complete.
								<-pauseDoneChan
							}
							return s.resumeOnceAndCheckStop(command, allowNextStateChange)
						}

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						checkLogMessage(t, client.ExpectOutputEvent(t), 1, "in callme!", fixture.Source, 6)
						// Signal that the output event has been received.
						close(outputDoneChan)
						// Wait for the pause to be complete.
						<-pauseDoneChan
						se = client.ExpectStoppedEvent(t)
						if se.Body.Reason != "pause" {
							t.Errorf("got stopped event = %#v, \nwant Reason=\"pause\"", se)
						}
						checkStop(t, client, 1, "main.callme", 6)
					}
				},
				disconnect: true,
			}})
	})
}

// TestConcurrentBreakpointsLogPoints tests that a breakpoint set in the main
// goroutine is hit the correct number of times and log points set in the
// children goroutines produce the correct number of output events.
func TestConcurrentBreakpointsLogPoints(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.SkipNow()
	}
	tests := []struct {
		name        string
		fixture     string
		start       int
		breakpoints []int
	}{
		{
			name:        "source breakpoints",
			fixture:     "goroutinestackprog",
			breakpoints: []int{23},
		},
		{
			name:    "hardcoded breakpoint",
			fixture: "goroutinebreak",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			runTest(t, tt.fixture, func(client *daptest.Client, fixture protest.Fixture) {
				client.InitializeRequest()
				client.ExpectInitializeResponseAndCapabilities(t)

				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
				client.ExpectInitializedEvent(t)
				client.ExpectLaunchResponse(t)

				bps := append([]int{8}, tt.breakpoints...)
				logMessages := map[int]string{8: "hello"}
				client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
				client.ExpectSetBreakpointsResponse(t)

				client.ConfigurationDoneRequest()
				client.ExpectConfigurationDoneResponse(t)

				// There may be up to 1 breakpoint and any number of log points that are
				// hit concurrently. We should get a stopped event everytime the breakpoint
				// is hit and an output event for each log point hit.
				var oeCount, seCount int
				for oeCount < 10 || seCount < 10 {
					switch m := client.ExpectMessage(t).(type) {
					case *dap.StoppedEvent:
						if m.Body.Reason != "breakpoint" || !m.Body.AllThreadsStopped || m.Body.ThreadId != 1 {
							t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", m)
						}
						seCount++
						client.ContinueRequest(1)
					case *dap.OutputEvent:
						checkLogMessage(t, m, -1, "hello", fixture.Source, 8)
						oeCount++
					case *dap.ContinueResponse:
					case *dap.TerminatedEvent:
						t.Fatalf("\nexpected 10 output events and 10 stopped events, got %d output events and %d stopped events", oeCount, seCount)
					default:
						t.Fatalf("Unexpected message type: expect StoppedEvent, OutputEvent, or ContinueResponse, got %#v", m)
					}
				}
				// TODO(suzmue): The dap server may identify some false
				// positives for hard coded breakpoints, so there may still
				// be more stopped events.
				client.DisconnectRequestWithKillOption(true)
			})
		})
	}
}

func TestSetBreakpointWhileRunning(t *testing.T) {
	runTest(t, "integrationprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					// The program loops 3 times over lines 14-15-8-9-10-16
					checkStop(t, client, 1, "main.main", 16) // Line that sleeps for 1 second

					// We can set breakpoints while nexting
					client.NextRequest(1)
					client.ExpectNextResponse(t)
					client.SetBreakpointsRequest(fixture.Source, []int{15}) // [16,] => [15,]
					checkSetBreakpointsResponse(t, []Breakpoint{{15, fixture.Source, true, ""}}, client.ExpectSetBreakpointsResponse(t))
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "step" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='step' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 14)
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 15)

					// We can set breakpoints while continuing
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.SetBreakpointsRequest(fixture.Source, []int{9}) // [15,] => [9,]
					checkSetBreakpointsResponse(t, []Breakpoint{{9, fixture.Source, true, ""}}, client.ExpectSetBreakpointsResponse(t))
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.sayhi", 9)

				},
				disconnect: true,
			}})
	})
}

func TestSetFunctionBreakpointWhileRunning(t *testing.T) {
	runTest(t, "integrationprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					// The program loops 3 times over lines 14-15-8-9-10-16
					checkStop(t, client, 1, "main.main", 16) // Line that sleeps for 1 second

					// We can set breakpoints while nexting
					client.NextRequest(1)
					client.ExpectNextResponse(t)
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{{Name: "main.sayhi"}}) // [16,] => [16, 8]
					checkBreakpoints(t, []Breakpoint{{8, fixture.Source, true, ""}}, client.ExpectSetFunctionBreakpointsResponse(t).Body.Breakpoints)
					client.SetBreakpointsRequest(fixture.Source, []int{}) // [16,8] => [8]
					expectSetBreakpointsResponse(t, client, []Breakpoint{})
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "step" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='step' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 14)

					// Make sure we can hit the breakpoints.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "function breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='function breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.sayhi", 8)

					// We can set breakpoints while continuing
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{}) // [8,] => []
					checkBreakpoints(t, []Breakpoint{}, client.ExpectSetFunctionBreakpointsResponse(t).Body.Breakpoints)
					client.SetBreakpointsRequest(fixture.Source, []int{16}) // [] => [16]
					expectSetBreakpointsResponse(t, client, []Breakpoint{{16, fixture.Source, true, ""}})
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 16)

				},
				disconnect: true,
			}})
	})
}

func TestHitConditionBreakpoints(t *testing.T) {
	runTest(t, "break", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{4},
			[]onBreakpoint{{
				execute: func() {
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "4"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{7, fixture.Source, true, ""}})

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 7)

					// Check that we are stopped at the correct value of i.
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "4", "int", noChildren)

					// Change the hit condition.
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "% 2"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{7, fixture.Source, true, ""}})

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 7)

					// Check that we are stopped at the correct value of i.
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "6", "int", noChildren)

					// Expect an error if an assignment is passed.
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "= 2"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{-1, "", false, ""}})

					// Change the hit condition.
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "< 8"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{7, fixture.Source, true, ""}})
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 7)

					// Check that we are stopped at the correct value of i.
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "7", "int", noChildren)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					client.ExpectTerminatedEvent(t)
				},
				disconnect: false,
			}})
	})
}

// TestLaunchSubstitutePath sets a breakpoint using a path
// that does not exist and expects the substitutePath attribute
// in the launch configuration to take care of the mapping.
func TestLaunchSubstitutePath(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		substitutePathTestHelper(t, fixture, client, "launch", map[string]interface{}{"mode": "exec", "program": fixture.Path})
	})
}

// TestAttachSubstitutePath sets a breakpoint using a path
// that does not exist and expects the substitutePath attribute
// in the launch configuration to take care of the mapping.
func TestAttachSubstitutePath(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.SkipNow()
	}
	if runtime.GOOS == "windows" {
		t.Skip("test skipped on windows, see https://delve.beta.teamcity.com/project/Delve_windows for details")
	}
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		cmd := execFixture(t, fixture)

		substitutePathTestHelper(t, fixture, client, "attach", map[string]interface{}{"mode": "local", "processId": cmd.Process.Pid})
	})
}

func substitutePathTestHelper(t *testing.T, fixture protest.Fixture, client *daptest.Client, request string, launchAttachConfig map[string]interface{}) {
	t.Helper()
	nonexistentDir := filepath.Join(string(filepath.Separator), "path", "that", "does", "not", "exist")
	if runtime.GOOS == "windows" {
		nonexistentDir = "C:" + nonexistentDir
	}

	launchAttachConfig["stopOnEntry"] = false
	// The rules in 'substitutePath' will be applied as follows:
	// - mapping paths from client to server:
	//		The first rule["from"] to match a prefix of 'path' will be applied:
	//			strings.Replace(path, rule["from"], rule["to"], 1)
	// - mapping paths from server to client:
	//		The first rule["to"] to match a prefix of 'path' will be applied:
	//			strings.Replace(path, rule["to"], rule["from"], 1)
	launchAttachConfig["substitutePath"] = []map[string]string{
		{"from": nonexistentDir, "to": filepath.Dir(fixture.Source)},
		// Since the path mappings are ordered, when converting from client path to
		// server path, this mapping will not apply, because nonexistentDir appears in
		// an earlier rule.
		{"from": nonexistentDir, "to": "this_is_a_bad_path"},
		// Since the path mappings are ordered, when converting from server path to
		// client path, this mapping will not apply, because filepath.Dir(fixture.Source)
		// appears in an earlier rule.
		{"from": "this_is_a_bad_path", "to": filepath.Dir(fixture.Source)},
	}

	runDebugSessionWithBPs(t, client, request,
		func() {
			switch request {
			case "attach":
				client.AttachRequest(launchAttachConfig)
				client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
			case "launch":
				client.LaunchRequestWithArgs(launchAttachConfig)
			default:
				t.Fatalf("invalid request: %s", request)
			}
		},
		// Set breakpoints
		filepath.Join(nonexistentDir, "loopprog.go"), []int{8},
		[]onBreakpoint{{

			execute: func() {
				checkStop(t, client, 1, "main.loop", 8)
			},
			disconnect: true,
		}})
}

// execFixture runs the binary fixture.Path and hooks up stdout and stderr
// to os.Stdout and os.Stderr.
func execFixture(t *testing.T, fixture protest.Fixture) *exec.Cmd {
	t.Helper()
	// TODO(polina): do I need to sanity check testBackend and runtime.GOOS?
	cmd := exec.Command(fixture.Path)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Start(); err != nil {
		t.Fatal(err)
	}
	return cmd
}

// TestWorkingDir executes to a breakpoint and tests that the specified
// working directory is the one used to run the program.
func TestWorkingDir(t *testing.T) {
	runTest(t, "workdir", func(client *daptest.Client, fixture protest.Fixture) {
		wd := os.TempDir()
		// For Darwin `os.TempDir()` returns `/tmp` which is symlink to `/private/tmp`.
		if runtime.GOOS == "darwin" {
			wd = "/private/tmp"
		}
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode":        "exec",
					"program":     fixture.Path,
					"stopOnEntry": false,
					"cwd":         wd,
				})
			},
			// Set breakpoints
			fixture.Source, []int{10}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 10)
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 2)
					for i := range locals.Body.Variables {
						switch locals.Body.Variables[i].Name {
						case "pwd":
							checkVarExact(t, locals, i, "pwd", "pwd", fmt.Sprintf("%q", wd), "string", noChildren)
						case "err":
							checkVarExact(t, locals, i, "err", "err", "error nil", "error", noChildren)
						}
					}
				},
				disconnect: false,
			}})
	})
}

// checkEval is a helper for verifying the values within an EvaluateResponse.
//
//	value - the value of the evaluated expression
//	hasRef - true if the evaluated expression should have children and therefore a non-0 variable reference
//	ref - reference to retrieve children of this evaluated expression (0 if none)
func checkEval(t *testing.T, got *dap.EvaluateResponse, value string, hasRef bool) (ref int) {
	t.Helper()
	if got.Body.Result != value || (got.Body.VariablesReference > 0) != hasRef {
		t.Errorf("\ngot  %#v\nwant Result=%q hasRef=%t", got, value, hasRef)
	}
	return got.Body.VariablesReference
}

// checkEvalIndexed is a helper for verifying the values within an EvaluateResponse.
//
//	value - the value of the evaluated expression
//	hasRef - true if the evaluated expression should have children and therefore a non-0 variable reference
//	ref - reference to retrieve children of this evaluated expression (0 if none)
func checkEvalIndexed(t *testing.T, got *dap.EvaluateResponse, value string, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	if got.Body.Result != value || (got.Body.VariablesReference > 0) != hasRef || got.Body.IndexedVariables != indexed || got.Body.NamedVariables != named {
		t.Errorf("\ngot  %#v\nwant Result=%q hasRef=%t IndexedVariables=%d NamedVariables=%d", got, value, hasRef, indexed, named)
	}
	return got.Body.VariablesReference
}

func checkEvalRegex(t *testing.T, got *dap.EvaluateResponse, valueRegex string, hasRef bool) (ref int) {
	t.Helper()
	matched, _ := regexp.MatchString(valueRegex, got.Body.Result)
	if !matched || (got.Body.VariablesReference > 0) != hasRef {
		t.Errorf("\ngot  %#v\nwant Result=%q hasRef=%t", got, valueRegex, hasRef)
	}
	return got.Body.VariablesReference
}

func TestEvaluateRequest(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{}, // Breakpoint set in the program
			[]onBreakpoint{{ // Stop at first breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.foobar", 66)

					// Variable lookup
					client.EvaluateRequest("a2", 1000, "this context will be ignored")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, "6", noChildren)

					client.EvaluateRequest("a5", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref := checkEval(t, got, "[]int len: 5, cap: 5, [1,2,3,4,5]", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a5 := client.ExpectVariablesResponse(t)
						checkChildren(t, a5, "a5", 5)
						checkVarExact(t, a5, 0, "[0]", "(a5)[0]", "1", "int", noChildren)
						checkVarExact(t, a5, 4, "[4]", "(a5)[4]", "5", "int", noChildren)
						validateEvaluateName(t, client, a5, 0)
						validateEvaluateName(t, client, a5, 4)
					}

					// Variable lookup that's not fully loaded
					client.EvaluateRequest("ba", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEvalIndexed(t, got, "[]int len: 200, cap: 200, [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...+136 more]", hasChildren, 200, 0)

					// All (binary and unary) on basic types except <-, ++ and --
					client.EvaluateRequest("1+1", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", noChildren)

					// Comparison operators on any type
					client.EvaluateRequest("1<2", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "true", noChildren)

					// Type casts between numeric types
					client.EvaluateRequest("int(2.3)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", noChildren)

					// Type casts of integer constants into any pointer type and vice versa
					client.EvaluateRequest("(*int)(2)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalRegex(t, got, `\*\(unreadable .+\)`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						val := client.ExpectVariablesResponse(t)
						checkChildren(t, val, "*(*int)(2)", 1)
						checkVarRegex(t, val, 0, "^$", `\(\*\(\(\*int\)\(2\)\)\)`, `\(unreadable .+\)`, "int", noChildren)
						validateEvaluateName(t, client, val, 0)
					}

					// Type casts between string, []byte and []rune
					client.EvaluateRequest("[]byte(\"ABC€\")", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEvalIndexed(t, got, "[]uint8 len: 6, cap: 6, [65,66,67,226,130,172]", noChildren, 6, 0)

					// Struct member access (i.e. somevar.memberfield)
					client.EvaluateRequest("ms.Nest.Level", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "1", noChildren)

					// Slicing and indexing operators on arrays, slices and strings
					client.EvaluateRequest("a5[4]", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "5", noChildren)

					// Map access
					client.EvaluateRequest("mp[1]", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, "interface {}(int) 42", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						expr := client.ExpectVariablesResponse(t)
						checkChildren(t, expr, "mp[1]", 1)
						checkVarExact(t, expr, 0, "data", "(mp[1]).(data)", "42", "int", noChildren)
						validateEvaluateName(t, client, expr, 0)
					}

					// Pointer dereference
					client.EvaluateRequest("*ms.Nest", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalRegex(t, got, `main\.Nest {Level: 1, Nest: \*main.Nest {Level: 2, Nest: \*\(\*main\.Nest\)\(0x[0-9a-f]+\)}}`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						expr := client.ExpectVariablesResponse(t)
						checkChildren(t, expr, "*ms.Nest", 2)
						checkVarExact(t, expr, 0, "Level", "(*ms.Nest).Level", "1", "int", noChildren)
						validateEvaluateName(t, client, expr, 0)
					}

					// Calls to builtin functions: cap, len, complex, imag and real
					client.EvaluateRequest("len(a5)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "5", noChildren)

					// Type assertion on interface variables (i.e. somevar.(concretetype))
					client.EvaluateRequest("mp[1].(int)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "42", noChildren)
				},
				disconnect: false,
			}, { // Stop at second breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.barfoo", 27)

					// Top-most frame
					client.EvaluateRequest("a1", 1000, "this context will be ignored")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"bur\"", noChildren)
					// No frame defaults to top-most frame
					client.EvaluateRequest("a1", 0, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"bur\"", noChildren)
					// Next frame
					client.EvaluateRequest("a1", 1001, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"foofoofoofoofoofoo\"", noChildren)
					// Next frame
					client.EvaluateRequest("a1", 1002, "any context but watch")
					erres := client.ExpectVisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: could not find symbol value for a1" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "watch")
					erres = client.ExpectInvisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: could not find symbol value for a1" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "repl")
					erres = client.ExpectInvisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: could not find symbol value for a1" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "hover")
					erres = client.ExpectInvisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: could not find symbol value for a1" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "clipboard")
					erres = client.ExpectVisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: could not find symbol value for a1" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
				},
				disconnect: false,
			}})
	})
}

func formatConfig(depth int, showGlobals, showRegisters bool, goroutineFilters string, hideSystemGoroutines bool, substitutePath [][2]string) string {
	formatStr := `stackTraceDepth	%d
showGlobalVariables	%v
showRegisters	%v
goroutineFilters	%q
hideSystemGoroutines	%v
substitutePath	%v
`
	return fmt.Sprintf(formatStr, depth, showGlobals, showRegisters, goroutineFilters, hideSystemGoroutines, substitutePath)
}

func TestEvaluateCommandRequest(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{}, // Breakpoint set in the program
			[]onBreakpoint{{ // Stop at first breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.foobar", 66)

					// Request help.
					const dlvHelp = `The following commands are available:
    dlv help (alias: h) 	 Prints the help message.
    dlv config 	 Changes configuration parameters.
    dlv sources (alias: s) 	 Print list of source files.

Type 'dlv help' followed by a command for full documentation.
`
					client.EvaluateRequest("dlv help", 1000, "repl")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, dlvHelp, noChildren)

					client.EvaluateRequest("dlv help config", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, msgConfig, noChildren)

					// Test config.
					client.EvaluateRequest("dlv config -list", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, formatConfig(50, false, false, "", false, [][2]string{}), noChildren)

					// Read and modify showGlobalVariables.
					client.EvaluateRequest("dlv config -list showGlobalVariables", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "showGlobalVariables\tfalse\n", noChildren)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					if len(scopes.Body.Scopes) > 1 {
						t.Errorf("\ngot  %#v\nwant len(scopes)=1 (Locals)", scopes)
					}
					checkScope(t, scopes, 0, "Locals", -1)

					client.EvaluateRequest("dlv config showGlobalVariables true", 1000, "repl")
					client.ExpectInvalidatedEvent(t)
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "showGlobalVariables\ttrue\n\nUpdated", noChildren)

					client.EvaluateRequest("dlv config -list", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, formatConfig(50, true, false, "", false, [][2]string{}), noChildren)

					client.ScopesRequest(1000)
					scopes = client.ExpectScopesResponse(t)
					if len(scopes.Body.Scopes) < 2 {
						t.Errorf("\ngot  %#v\nwant len(scopes)=2 (Locals & Globals)", scopes)
					}
					checkScope(t, scopes, 0, "Locals", -1)
					checkScope(t, scopes, 1, "Globals (package main)", -1)

					// Read and modify substitutePath.
					client.EvaluateRequest("dlv config -list substitutePath", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[]\n", noChildren)

					client.EvaluateRequest(fmt.Sprintf("dlv config substitutePath %q %q", "my/client/path", "your/server/path"), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[[my/client/path your/server/path]]\n\nUpdated", noChildren)

					client.EvaluateRequest(fmt.Sprintf("dlv config substitutePath %q %q", "my/client/path", "new/your/server/path"), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[[my/client/path new/your/server/path]]\n\nUpdated", noChildren)

					client.EvaluateRequest(fmt.Sprintf("dlv config substitutePath %q", "my/client/path"), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[]\n\nUpdated", noChildren)

					// Test sources.
					client.EvaluateRequest("dlv sources", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					if !strings.Contains(got.Body.Result, fixture.Source) {
						t.Errorf("\ngot: %#v, want sources contains %s", got, fixture.Source)
					}

					client.EvaluateRequest(fmt.Sprintf("dlv sources .*%s", strings.ReplaceAll(filepath.Base(fixture.Source), ".", "\\.")), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					if got.Body.Result != fixture.Source {
						t.Errorf("\ngot: %#v, want sources=%q", got, fixture.Source)
					}

					client.EvaluateRequest("dlv sources nonexistentsource", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					if got.Body.Result != "" {
						t.Errorf("\ngot: %#v, want sources=\"\"", got)
					}

					// Test bad inputs.
					client.EvaluateRequest("dlv help bad", 1000, "repl")
					client.ExpectErrorResponse(t)

					client.EvaluateRequest("dlv bad", 1000, "repl")
					client.ExpectErrorResponse(t)
				},
				disconnect: true,
			}})
	})
}

// From testvariables2 fixture
const (
	// As defined in the code
	longstr = `"very long string 0123456789a0123456789b0123456789c0123456789d0123456789e0123456789f0123456789g012345678h90123456789i0123456789j0123456789"`
	// Loaded with MaxStringLen=64
	longstrLoaded64   = `"very long string 0123456789a0123456789b0123456789c0123456789d012...+73 more"`
	longstrLoaded64re = `\"very long string 0123456789a0123456789b0123456789c0123456789d012\.\.\.\+73 more\"`
)

// TestVariableValueTruncation tests that in certain cases
// we truncate the loaded variable values to make display more user-friendly.
func TestVariableValueTruncation(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoint set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// Compound variable values may be truncated
					m1Full := `map\[string\]main\.astruct \[(\"[A-Za-z]+\": {A: [0-9]+, B: [0-9]+}, )+,\.\.\.\+2 more\]`
					m1Part := `map\[string\]main\.astruct \[(\"[A-Za-z]+\": {A: [0-9]+, B: [0-9]+}, )+.+\.\.\.`

					// In variable responses
					checkVarRegex(t, locals, -1, "m1", "m1", m1Part, `map\[string\]main\.astruct`, hasChildren)

					// In evaluate responses (select contexts only)
					tests := []struct {
						context string
						want    string
					}{
						{"", m1Part},
						{"watch", m1Part},
						{"repl", m1Part},
						{"hover", m1Part},
						{"variables", m1Full}, // used for copy
						{"clipboard", m1Full}, // used for copy
						{"somethingelse", m1Part},
					}
					for _, tc := range tests {
						t.Run(tc.context, func(t *testing.T) {
							client.EvaluateRequest("m1", 0, tc.context)
							checkEvalRegex(t, client.ExpectEvaluateResponse(t), tc.want, hasChildren)
						})
					}

					// Compound map keys may be truncated even further
					// As the keys are always inside of a map container,
					// this applies to variables requests only, not evalute requests.

					// key - compound, value - scalar (inlined key:value display) => truncate key if too long
					ref := checkVarExact(t, locals, -1, "m5", "m5", "map[main.C]int [{s: "+longstr+"}: 1, ]", "map[main.C]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						// Key format: <truncated>... @<address>
						checkVarRegex(t, client.ExpectVariablesResponse(t), 1, `main\.C {s: "very long string 0123456789.+\.\.\. @ 0x[0-9a-f]+`, `m5\[\(\*\(\*"main\.C"\)\(0x[0-9a-f]+\)\)\]`, "1", `int`, hasChildren)
					}
					// key - scalar, value - scalar (inlined key:value display) => key not truncated
					ref = checkVarExact(t, locals, -1, "m6", "m6", "map[string]int ["+longstr+": 123, ]", "map[string]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						checkVarExact(t, client.ExpectVariablesResponse(t), 1, longstr, `m6[`+longstr+`]`, "123", "string: int", noChildren)
					}
					// key - compound, value - compound (array-like display) => key not truncated
					ref = checkVarExact(t, locals, -1, "m7", "m7", "map[main.C]main.C [{s: "+longstr+"}: {s: \"hello\"}, ]", "map[main.C]main.C", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m7 := client.ExpectVariablesResponse(t)
						checkVarRegex(t, m7, 1, "[key 0]", `\(\*\(\*\"main\.C\"\)\(0x[0-9a-f]+\)\)`, `main\.C {s: `+longstr+`}`, `main\.C`, hasChildren)
					}
				},
				disconnect: true,
			}})
	})
}

// TestVariableLoadingOfLongStrings tests that different string loading limits
// apply that depending on the context.
func TestVariableLoadingOfLongStrings(t *testing.T) {
	protest.MustSupportFunctionCalls(t, testBackend)
	runTest(t, "longstrings", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoint set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// Limits vary for evaluate requests with different contexts
					tests := []struct {
						context string
						limit   int
					}{
						{"", DefaultLoadConfig.MaxStringLen},
						{"watch", DefaultLoadConfig.MaxStringLen},
						{"repl", maxSingleStringLen},
						{"hover", maxSingleStringLen},
						{"variables", maxSingleStringLen},
						{"clipboard", maxSingleStringLen},
						{"somethingelse", DefaultLoadConfig.MaxStringLen},
					}
					for _, tc := range tests {
						t.Run(tc.context, func(t *testing.T) {
							// Long string by itself (limits vary)
							client.EvaluateRequest("s4097", 0, tc.context)
							want := fmt.Sprintf(`"x+\.\.\.\+%d more"`, 4097-tc.limit)
							checkEvalRegex(t, client.ExpectEvaluateResponse(t), want, noChildren)

							// Evaluated container variables return values with minimally loaded
							// strings, which are further truncated for displaying, so we
							// can't test for loading limit except in contexts where an untruncated
							// value is returned.
							client.EvaluateRequest("&s4097", 0, tc.context)
							switch tc.context {
							case "variables", "clipboard":
								want = fmt.Sprintf(`\*"x+\.\.\.\+%d more`, 4097-DefaultLoadConfig.MaxStringLen)
							default:
								want = fmt.Sprintf(`\*"x{%d}\.\.\.`, maxVarValueLen-2)
							}
							checkEvalRegex(t, client.ExpectEvaluateResponse(t), want, hasChildren)
						})
					}

					// Long strings returned from calls are subject to a different limit,
					// same limit regardless of context
					for _, context := range []string{"", "watch", "repl", "variables", "hover", "clipboard", "somethingelse"} {
						t.Run(context, func(t *testing.T) {
							client.EvaluateRequest(`call buildString(4097)`, 1000, context)
							want := fmt.Sprintf(`"x+\.\.\.\+%d more"`, 4097-maxStringLenInCallRetVars)
							got := client.ExpectEvaluateResponse(t)
							checkEvalRegex(t, got, want, hasChildren)
						})
					}

					// Variables requests use the most conservative loading limit
					checkVarRegex(t, locals, -1, "s513", "s513", `"x{512}\.\.\.\+1 more"`, "string", noChildren)
					// Container variables are subject to additional stricter value truncation that drops +more part
					checkVarRegex(t, locals, -1, "nested", "nested", `map\[int\]string \[513: \"x+\.\.\.`, "string", hasChildren)
				},
				disconnect: true,
			}})
	})
}

func TestEvaluateCallRequest(t *testing.T) {
	protest.MustSupportFunctionCalls(t, testBackend)
	runTest(t, "fncall", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{88},
			[]onBreakpoint{{ // Stop in makeclos()
				execute: func() {
					checkStop(t, client, 1, "main.makeclos", 88)

					// Topmost frame: both types of expressions should work
					client.EvaluateRequest("callstacktrace", 1000, "this context will be ignored")
					client.ExpectEvaluateResponse(t)
					client.EvaluateRequest("call callstacktrace()", 1000, "this context will be ignored")
					client.ExpectEvaluateResponse(t)

					// Next frame: only non-call expressions will work
					client.EvaluateRequest("callstacktrace", 1001, "this context will be ignored")
					client.ExpectEvaluateResponse(t)
					client.EvaluateRequest("call callstacktrace()", 1001, "not watch")
					erres := client.ExpectVisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: call is only supported with topmost stack frame" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: call is only supported with topmost stack frame\"", erres)
					}

					// A call can stop on a breakpoint
					client.EvaluateRequest("call callbreak()", 1000, "not watch")
					s := client.ExpectStoppedEvent(t)
					if s.Body.Reason != "hardcoded breakpoint" {
						t.Errorf("\ngot %#v\nwant Reason=\"hardcoded breakpoint\"", s)
					}
					erres = client.ExpectVisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: call stopped" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: call stopped\"", erres)
					}

					// A call during a call causes an error
					client.EvaluateRequest("call callstacktrace()", 1000, "not watch")
					erres = client.ExpectVisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: cannot call function while another function call is already in progress" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: cannot call function while another function call is already in progress\"", erres)
					}

					// Complete the call and get back to original breakpoint in makeclos()
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.makeclos", 88)

					// Inject a call for the same function that is stopped at breakpoint:
					// it might stop at the exact same breakpoint on the same goroutine,
					// but we should still detect that its an injected call that stopped
					// and not the return to the original point of injection after it
					// completed.
					client.EvaluateRequest("call makeclos(nil)", 1000, "not watch")
					stopped := client.ExpectStoppedEvent(t)
					erres = client.ExpectVisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: call stopped" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: call stopped\"", erres)
					}
					checkStop(t, client, stopped.Body.ThreadId, "main.makeclos", 88)

					// Complete the call and get back to original breakpoint in makeclos()
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.makeclos", 88)
				},
				disconnect: false,
			}, { // Stop at runtime breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					// No return values
					client.EvaluateRequest("call call0(1, 2)", 1000, "this context will be ignored")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, "", noChildren)
					// One unnamed return value
					client.EvaluateRequest("call call1(one, two)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref := checkEval(t, got, "3", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rv := client.ExpectVariablesResponse(t)
						checkChildren(t, rv, "rv", 1)
						checkVarExact(t, rv, 0, "~r2", "", "3", "int", noChildren)
					}
					// One named return value
					// Panic doesn't panic, but instead returns the error as a named return variable
					client.EvaluateRequest("call callpanic()", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, `interface {}(string) "callpanic panicked"`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rv := client.ExpectVariablesResponse(t)
						checkChildren(t, rv, "rv", 1)
						ref = checkVarExact(t, rv, 0, "~panic", "", `interface {}(string) "callpanic panicked"`, "interface {}", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							p := client.ExpectVariablesResponse(t)
							checkChildren(t, p, "~panic", 1)
							checkVarExact(t, p, 0, "data", "", "\"callpanic panicked\"", "string", noChildren)
						}
					}
					// Multiple return values
					client.EvaluateRequest("call call2(one, two)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, "1, 2", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rvs := client.ExpectVariablesResponse(t)
						checkChildren(t, rvs, "rvs", 2)
						checkVarExact(t, rvs, 0, "~r2", "", "1", "int", noChildren)
						checkVarExact(t, rvs, 1, "~r3", "", "2", "int", noChildren)
					}
					// No frame defaults to top-most frame
					client.EvaluateRequest("call call1(one, two)", 0, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "3", hasChildren)
					// Extra spaces don't matter
					client.EvaluateRequest(" call  call1(one, one) ", 0, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", hasChildren)
					// Just 'call', even with extra space, is treated as {expression}
					client.EvaluateRequest("call ", 1000, "watch")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"this is a variable named `call`\"", noChildren)

					// Call error
					client.EvaluateRequest("call call1(one)", 1000, "watch")
					erres := client.ExpectInvisibleErrorResponse(t)
					if erres.Body.Error.Format != "Unable to evaluate expression: not enough arguments" {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: not enough arguments\"", erres)
					}

					// Assignment - expect no error, but no return value.
					client.EvaluateRequest("call one = two", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "", noChildren)
					// Check one=two was applied.
					client.EvaluateRequest("one", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", noChildren)

					// Call can exit.
					client.EvaluateRequest("call callexit()", 1000, "this context will be ignored")
					client.ExpectTerminatedEvent(t)
					if res := client.ExpectVisibleErrorResponse(t); !strings.Contains(res.Body.Error.Format, "terminated") {
						t.Errorf("\ngot %#v\nwant Format=.*terminated.*", res)
					}
				},
				terminated: true,
				disconnect: true,
			}})
	})
}

func TestNextAndStep(t *testing.T) {
	runTest(t, "testinline", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{11},
			[]onBreakpoint{{ // Stop at line 11
				execute: func() {
					checkStop(t, client, 1, "main.initialize", 11)

					expectStop := func(fun string, line int) {
						t.Helper()
						se := client.ExpectStoppedEvent(t)
						if se.Body.Reason != "step" || se.Body.ThreadId != 1 || !se.Body.AllThreadsStopped {
							t.Errorf("got %#v, want Reason=\"step\", ThreadId=1, AllThreadsStopped=true", se)
						}
						checkStop(t, client, 1, fun, line)
					}

					client.StepOutRequest(1)
					client.ExpectStepOutResponse(t)
					expectStop("main.main", 18)

					client.NextRequest(1)
					client.ExpectNextResponse(t)
					expectStop("main.main", 19)

					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					expectStop("main.inlineThis", 5)

					client.NextRequest(-1000)
					client.ExpectNextResponse(t)
					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "error" || se.Body.Text != "unknown goroutine -1000" {
						t.Errorf("got %#v, want Reason=\"error\", Text=\"unknown goroutine -1000\"", se)
					}
					checkStop(t, client, 1, "main.inlineThis", 5)
				},
				disconnect: false,
			}})
	})
}

func TestHardCodedBreakpoints(t *testing.T) {
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{28},
			[]onBreakpoint{{ // Stop at line 28
				execute: func() {
					checkStop(t, client, 1, "main.main", 28)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "breakpoint" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"breakpoint\"", se)
					}
				},
				disconnect: false,
			}})
	})
}

// TestStepInstruction executes to a breakpoint and tests stepping
// a single instruction
func TestStepInstruction(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{32}, // b main.foobar
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.foobar", 32)

					pc, err := getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}

					// The exact instructions may change due to compiler changes,
					// but we want to make sure that all of our instructions are
					// instantiating variables, since these should not include
					// jumps.
					verifyExpectedLocation := func() {
						client.StackTraceRequest(1, 0, 20)
						st := client.ExpectStackTraceResponse(t)
						if len(st.Body.StackFrames) < 1 {
							t.Errorf("\ngot  %#v\nwant len(stackframes) => 1", st)
						} else {
							// There is a hardcoded breakpoint on line 32. All of the
							// steps should be completed before that line.
							if st.Body.StackFrames[0].Line < 32 {
								t.Errorf("\ngot  %#v\nwant Line<32", st)
							}
							if st.Body.StackFrames[0].Name != "main.foobar" {
								t.Errorf("\ngot  %#v\nwant Name=\"main.foobar\"", st)
							}
						}
					}

					// Next instruction.
					client.NextInstructionRequest(1)
					client.ExpectNextResponse(t)
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "step" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"step\"", se)
					}
					verifyExpectedLocation()
					nextPC, err := getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}
					if nextPC <= pc {
						t.Errorf("got %#x, expected InstructionPointerReference>%#x", nextPC, pc)
					}

					// StepIn instruction.
					pc = nextPC
					client.StepInInstructionRequest(1)
					client.ExpectStepInResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "step" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"step\"", se)
					}
					verifyExpectedLocation()
					nextPC, err = getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}
					if nextPC <= pc {
						t.Errorf("got %#x, expected InstructionPointerReference>%#x", nextPC, pc)
					}

					// StepOut Instruction.
					pc = nextPC
					client.StepOutInstructionRequest(1)
					client.ExpectStepOutResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "step" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"step\"", se)
					}
					verifyExpectedLocation()
					nextPC, err = getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}
					if nextPC <= pc {
						t.Errorf("got %#x, expected InstructionPointerReference>%#x", nextPC, pc)
					}
				},
				disconnect: true,
			}})
	})
}

func getPC(t *testing.T, client *daptest.Client, threadId int) (uint64, error) {
	client.StackTraceRequest(threadId, 0, 1)
	st := client.ExpectStackTraceResponse(t)
	if len(st.Body.StackFrames) < 1 {
		t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
	}
	return strconv.ParseUint(st.Body.StackFrames[0].InstructionPointerReference, 0, 64)
}

// TestNextParked tests that we can switched selected goroutine to a parked one
// and perform next operation on it.
func TestNextParked(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.SkipNow()
	}
	runTest(t, "parallel_next", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{15},
			[]onBreakpoint{{ // Stop at line 15
				execute: func() {
					if parkedGoid := testNextParkedHelper(t, client, fixture); parkedGoid >= 0 {
						client.NextRequest(parkedGoid)
						client.ExpectNextResponse(t)

						se := client.ExpectStoppedEvent(t)
						if se.Body.ThreadId != parkedGoid {
							t.Fatalf("Next did not continue on the newly selected goroutine, expected %d got %d", parkedGoid, se.Body.ThreadId)
						}
					}
				},
				// Let the test harness continue to process termination
				// if it hasn't gotten there already.
				disconnect: false,
			}})
	})
}

// Finds a goroutine other than the selected one that is parked inside of main.sayhi and therefore
// still has a line to execute if resumed with next.
func testNextParkedHelper(t *testing.T, client *daptest.Client, fixture protest.Fixture) int {
	t.Helper()
	// Set a breakpoint at main.sayhi
	client.SetBreakpointsRequest(fixture.Source, []int{8})
	client.ExpectSetBreakpointsResponse(t)

	var parkedGoid = -1
	for parkedGoid < 0 {
		client.ContinueRequest(1)
		client.ExpectContinueResponse(t)
		event := client.ExpectMessage(t)
		switch event.(type) {
		case *dap.StoppedEvent:
			// ok
		case *dap.TerminatedEvent:
			// This is very unlikely to happen. But in theory if all sayhi
			// gouritines are run serially, there will never be a second parked
			// sayhi goroutine when another breaks and we will keep trying
			// until process termination.
			return -1
		}

		se := event.(*dap.StoppedEvent)

		client.ThreadsRequest()
		threads := client.ExpectThreadsResponse(t)

		// Search for a parked goroutine that we know for sure will have to be
		// resumed before the program can exit. This is a parked goroutine that:
		// 1. is executing main.sayhi
		// 2. hasn't called wg.Done yet
		// 3. is not the currently selected goroutine
		for _, g := range threads.Body.Threads {
			if g.Id == se.Body.ThreadId { // Skip selected goroutine
				continue
			}
			client.StackTraceRequest(g.Id, 0, 5)
			frames := client.ExpectStackTraceResponse(t)
			for _, frame := range frames.Body.StackFrames {
				// line 11 is the line where wg.Done is called
				if frame.Name == "main.sayhi" && frame.Line < 11 {
					parkedGoid = g.Id
					break
				}
			}
			if parkedGoid >= 0 {
				break
			}
		}
	}

	// Clear all breakpoints.
	client.SetBreakpointsRequest(fixture.Source, []int{})
	client.ExpectSetBreakpointsResponse(t)
	return parkedGoid
}

// TestStepOutPreservesGoroutine is inspired by proc_test.TestStepOutPreservesGoroutine
// and checks that StepOut preserves the currently selected goroutine.
func TestStepOutPreservesGoroutine(t *testing.T) {
	// Checks that StepOut preserves the currently selected goroutine.
	if runtime.GOOS == "freebsd" {
		t.SkipNow()
	}
	rand.Seed(time.Now().Unix())
	runTest(t, "issue2113", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{25},
			[]onBreakpoint{{ // Stop at line 25
				execute: func() {
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					// The program contains runtime.Breakpoint()
					se := client.ExpectStoppedEvent(t)

					client.ThreadsRequest()
					gs := client.ExpectThreadsResponse(t)

					candg := []int{}
					bestg := []int{}
					for _, g := range gs.Body.Threads {
						// We do not need to check the thread that the program
						// is currently stopped on.
						if g.Id == se.Body.ThreadId {
							continue
						}

						client.StackTraceRequest(g.Id, 0, 20)
						frames := client.ExpectStackTraceResponse(t)
						for _, frame := range frames.Body.StackFrames {
							if frame.Name == "main.coroutine" {
								candg = append(candg, g.Id)
								if strings.HasPrefix(frames.Body.StackFrames[0].Name, "runtime.") {
									bestg = append(bestg, g.Id)
								}
								break
							}
						}
					}
					var goroutineId int
					if len(bestg) > 0 {
						goroutineId = bestg[rand.Intn(len(bestg))]
						t.Logf("selected goroutine %d (best)\n", goroutineId)
					} else if len(candg) > 0 {
						goroutineId = candg[rand.Intn(len(candg))]
						t.Logf("selected goroutine %d\n", goroutineId)

					}

					if goroutineId != 0 {
						client.StepOutRequest(goroutineId)
						client.ExpectStepOutResponse(t)
					} else {
						client.ContinueRequest(-1)
						client.ExpectContinueResponse(t)
					}

					switch e := client.ExpectMessage(t).(type) {
					case *dap.StoppedEvent:
						if e.Body.ThreadId != goroutineId {
							t.Fatalf("StepOut did not continue on the selected goroutine, expected %d got %d", goroutineId, e.Body.ThreadId)
						}
					case *dap.TerminatedEvent:
						t.Logf("program terminated")
					default:
						t.Fatalf("Unexpected event type: expect stopped or terminated event, got %#v", e)
					}
				},
				disconnect: false,
			}})
	})
}
func checkStopOnNextWhileNextingError(t *testing.T, client *daptest.Client, threadID int) {
	t.Helper()
	oe := client.ExpectOutputEvent(t)
	if oe.Body.Category != "console" || oe.Body.Output != fmt.Sprintf("invalid command: %s\n", BetterNextWhileNextingError) {
		t.Errorf("\ngot  %#v\nwant Category=\"console\" Output=\"invalid command: %s\\n\"", oe, BetterNextWhileNextingError)
	}
	se := client.ExpectStoppedEvent(t)
	if se.Body.ThreadId != threadID || se.Body.Reason != "exception" || se.Body.Description != "invalid command" || se.Body.Text != BetterNextWhileNextingError {
		t.Errorf("\ngot  %#v\nwant ThreadId=%d Reason=\"exception\" Description=\"invalid command\" Text=\"%s\"", se, threadID, BetterNextWhileNextingError)
	}
	client.ExceptionInfoRequest(1)
	eInfo := client.ExpectExceptionInfoResponse(t)
	if eInfo.Body.ExceptionId != "invalid command" || eInfo.Body.Description != BetterNextWhileNextingError {
		t.Errorf("\ngot  %#v\nwant ExceptionId=\"invalid command\" Text=\"%s\"", eInfo, BetterNextWhileNextingError)
	}
}

func TestBadAccess(t *testing.T) {
	if runtime.GOOS != "darwin" || testBackend != "lldb" {
		t.Skip("not applicable")
	}
	runTest(t, "issue2078", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{4},
			[]onBreakpoint{{ // Stop at line 4
				execute: func() {
					checkStop(t, client, 1, "main.main", 4)

					expectStoppedOnError := func(errorPrefix string) {
						t.Helper()
						se := client.ExpectStoppedEvent(t)
						if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "runtime error" || !strings.HasPrefix(se.Body.Text, errorPrefix) {
							t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"runtime error\" Text=\"%s\"", se, errorPrefix)
						}
						client.ExceptionInfoRequest(1)
						eInfo := client.ExpectExceptionInfoResponse(t)
						if eInfo.Body.ExceptionId != "runtime error" || !strings.HasPrefix(eInfo.Body.Description, errorPrefix) {
							t.Errorf("\ngot  %#v\nwant ExceptionId=\"runtime error\" Text=\"%s\"", eInfo, errorPrefix)
						}
					}

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					expectStoppedOnError("invalid memory address or nil pointer dereference")

					client.NextRequest(1)
					client.ExpectNextResponse(t)
					expectStoppedOnError("invalid memory address or nil pointer dereference")

					client.NextRequest(1)
					client.ExpectNextResponse(t)
					checkStopOnNextWhileNextingError(t, client, 1)

					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					checkStopOnNextWhileNextingError(t, client, 1)

					client.StepOutRequest(1)
					client.ExpectStepOutResponse(t)
					checkStopOnNextWhileNextingError(t, client, 1)
				},
				disconnect: true,
			}})
	})
}

// TestNextWhileNexting is inspired by command_test.TestIssue387 and tests
// that when 'next' is interrupted by a 'breakpoint', calling 'next'
// again will produce an error with a helpful message, and 'continue'
// will resume the program.
func TestNextWhileNexting(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.Skip("test is not valid on FreeBSD")
	}
	// a breakpoint triggering during a 'next' operation will interrupt 'next''
	// Unlike the test for the terminal package, we cannot be certain
	// of the number of breakpoints we expect to hit, since multiple
	// breakpoints being hit at the same time is not supported in DAP stopped
	// events.
	runTest(t, "issue387", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{15},
			[]onBreakpoint{{ // Stop at line 15
				execute: func() {
					checkStop(t, client, 1, "main.main", 15)

					client.SetBreakpointsRequest(fixture.Source, []int{8})
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					bpSe := client.ExpectStoppedEvent(t)
					threadID := bpSe.Body.ThreadId
					checkStop(t, client, threadID, "main.dostuff", 8)

					for pos := 9; pos < 11; pos++ {
						client.NextRequest(threadID)
						client.ExpectNextResponse(t)

						stepInProgress := true
						for stepInProgress {
							m := client.ExpectStoppedEvent(t)
							switch m.Body.Reason {
							case "step":
								if !m.Body.AllThreadsStopped {
									t.Errorf("got %#v, want Reason=\"step\", AllThreadsStopped=true", m)
								}
								checkStop(t, client, m.Body.ThreadId, "main.dostuff", pos)
								stepInProgress = false
							case "breakpoint":
								if !m.Body.AllThreadsStopped {
									t.Errorf("got %#v, want Reason=\"breakpoint\", AllThreadsStopped=true", m)
								}

								if stepInProgress {
									// We encountered a breakpoint on a different thread. We should have to resume execution
									// using continue.
									oe := client.ExpectOutputEvent(t)
									if oe.Body.Category != "console" || !strings.Contains(oe.Body.Output, "Step interrupted by a breakpoint.") {
										t.Errorf("\ngot  %#v\nwant Category=\"console\" Output=\"Step interrupted by a breakpoint.\"", oe)
									}
									client.NextRequest(m.Body.ThreadId)
									client.ExpectNextResponse(t)
									checkStopOnNextWhileNextingError(t, client, m.Body.ThreadId)
									// Continue since we have not finished the step request.
									client.ContinueRequest(threadID)
									client.ExpectContinueResponse(t)
								} else {
									checkStop(t, client, m.Body.ThreadId, "main.dostuff", 8)
									// Switch to stepping on this thread instead.
									pos = 8
									threadID = m.Body.ThreadId
								}
							default:
								t.Fatalf("got %#v, want StoppedEvent on step or breakpoint", m)
							}
						}
					}
				},
				disconnect: true,
			}})
	})
}

func TestPanicBreakpointOnContinue(t *testing.T) {
	runTest(t, "panic", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{5},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 5)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					text := "\"BOOM!\""
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "panic" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"panic\" Text=%q", se, text)
					}

					client.ExceptionInfoRequest(1)
					eInfo := client.ExpectExceptionInfoResponse(t)
					if eInfo.Body.ExceptionId != "panic" || eInfo.Body.Description != text {
						t.Errorf("\ngot  %#v\nwant ExceptionId=\"panic\" Description=%q", eInfo, text)
					}

					client.StackTraceRequest(se.Body.ThreadId, 0, 20)
					st := client.ExpectStackTraceResponse(t)
					for i, frame := range st.Body.StackFrames {
						if strings.HasPrefix(frame.Name, "runtime.") {
							if frame.PresentationHint != "subtle" {
								t.Errorf("\ngot Body.StackFrames[%d]=%#v\nwant Source.PresentationHint=\"subtle\"", i, frame)
							}
						} else if frame.Source.PresentationHint != "" {
							t.Errorf("\ngot Body.StackFrames[%d]=%#v\nwant Source.PresentationHint=\"\"", i, frame)
						}

					}
				},
				disconnect: true,
			}})
	})
}

func TestPanicBreakpointOnNext(t *testing.T) {
	if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 14) {
		// In Go 1.13, 'next' will step into the defer in the runtime
		// main function, instead of the next line in the main program.
		t.SkipNow()
	}

	runTest(t, "panic", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{5},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 5)

					client.NextRequest(1)
					client.ExpectNextResponse(t)

					text := "\"BOOM!\""
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "panic" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"panic\" Text=%q", se, text)
					}

					client.ExceptionInfoRequest(1)
					eInfo := client.ExpectExceptionInfoResponse(t)
					if eInfo.Body.ExceptionId != "panic" || eInfo.Body.Description != text {
						t.Errorf("\ngot  %#v\nwant ExceptionId=\"panic\" Description=%q", eInfo, text)
					}
				},
				disconnect: true,
			}})
	})
}

func TestFatalThrowBreakpoint(t *testing.T) {
	runTest(t, "fatalerror", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{3},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 3)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					var text string
					// This does not work for Go 1.16.
					ver, _ := goversion.Parse(runtime.Version())
					if ver.Major != 1 || ver.Minor != 16 {
						text = "\"go of nil func value\""
					}

					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "fatal error" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"fatal error\" Text=%q", se, text)
					}

					// This does not work for Go 1.16.
					errorPrefix := text
					if errorPrefix == "" {
						errorPrefix = "Throw reason unavailable, see https://github.com/golang/go/issues/46425"
					}
					client.ExceptionInfoRequest(1)
					eInfo := client.ExpectExceptionInfoResponse(t)
					if eInfo.Body.ExceptionId != "fatal error" || !strings.HasPrefix(eInfo.Body.Description, errorPrefix) {
						t.Errorf("\ngot  %#v\nwant ExceptionId=\"runtime error\" Text=%s", eInfo, errorPrefix)
					}

				},
				disconnect: true,
			}})
	})
	runTest(t, "testdeadlock", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{3},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 3)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					// This does not work for Go 1.16 so skip by detecting versions before or after 1.16.
					var text string
					if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 16) || goversion.VersionAfterOrEqual(runtime.Version(), 1, 17) {
						text = "\"all goroutines are asleep - deadlock!\""
					}
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "exception" || se.Body.Description != "fatal error" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant Reason=\"exception\" Description=\"fatal error\" Text=%q", se, text)
					}

					// TODO(suzmue): Get the exception info for the thread and check the description
					// includes "all goroutines are asleep - deadlock!".
					// Stopped events with no selected goroutines need to be supported to test deadlock.
				},
				disconnect: true,
			}})
	})
}

// checkStop covers the standard sequence of requests issued by
// a client at a breakpoint or another non-terminal stop event.
// The details have been tested by other tests,
// so this is just a sanity check.
// Skips line check if line is -1.
func checkStop(t *testing.T, client *daptest.Client, thread int, fname string, line int) {
	t.Helper()
	client.ThreadsRequest()
	client.ExpectThreadsResponse(t)

	client.CheckStopLocation(t, thread, fname, line)

	client.ScopesRequest(1000)
	client.ExpectScopesResponse(t)

	client.VariablesRequest(localsScope)
	client.ExpectVariablesResponse(t)
}

// onBreakpoint specifies what the test harness should simulate at
// a stopped breakpoint. First execute() is to be called to test
// specified editor-driven or user-driven requests. Then if
// disconnect is true, the test harness will abort the program
// execution. Otherwise, a continue will be issued and the
// program will continue to the next breakpoint or termination.
// If terminated is true, we expect requests at this breakpoint
// to result in termination.
type onBreakpoint struct {
	execute    func()
	disconnect bool
	terminated bool
}

// runDebugSessionWithBPs is a helper for executing the common init and shutdown
// sequences for a program that does not stop on entry
// while specifying breakpoints and unique launch/attach criteria via parameters.
//
//	cmd            - "launch" or "attach"
//	cmdRequest     - a function that sends a launch or attach request,
//	                 so the test author has full control of its arguments.
//	                 Note that he rest of the test sequence assumes that
//	                 stopOnEntry is false.
//	 source        - source file path, needed to set breakpoints, "" if none to be set.
//	 breakpoints   - list of lines, where breakpoints are to be set
//	 onBPs         - list of test sequences to execute at each of the set breakpoints.
func runDebugSessionWithBPs(t *testing.T, client *daptest.Client, cmd string, cmdRequest func(), source string, breakpoints []int, onBPs []onBreakpoint) {
	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)

	cmdRequest()
	client.ExpectInitializedEvent(t)
	if cmd == "launch" {
		client.ExpectLaunchResponse(t)
	} else if cmd == "attach" {
		client.ExpectAttachResponse(t)
	} else {
		panic("expected launch or attach command")
	}

	if source != "" {
		client.SetBreakpointsRequest(source, breakpoints)
		client.ExpectSetBreakpointsResponse(t)
	}

	// Skip no-op setExceptionBreakpoints

	client.ConfigurationDoneRequest()
	client.ExpectConfigurationDoneResponse(t)

	// Program automatically continues to breakpoint or completion

	// TODO(polina): See if we can make this more like withTestProcessArgs in proc_test:
	// a single function pointer gets called here and then if it wants to continue it calls
	// client.ContinueRequest/client.ExpectContinueResponse/client.ExpectStoppedEvent
	// (possibly using a helper function).
	for _, onBP := range onBPs {
		client.ExpectStoppedEvent(t)
		onBP.execute()
		if onBP.disconnect {
			client.DisconnectRequestWithKillOption(true)
			if onBP.terminated {
				client.ExpectOutputEventProcessExitedAnyStatus(t)
				client.ExpectOutputEventDetaching(t)
			} else {
				client.ExpectOutputEventDetachingKill(t)
			}
			client.ExpectDisconnectResponse(t)
			client.ExpectTerminatedEvent(t)
			return
		}
		client.ContinueRequest(1)
		client.ExpectContinueResponse(t)
		// "Continue" is triggered after the response is sent
	}

	if cmd == "launch" { // Let the program run to completion
		client.ExpectTerminatedEvent(t)
	}
	client.DisconnectRequestWithKillOption(true)
	if cmd == "launch" {
		client.ExpectOutputEventProcessExitedAnyStatus(t)
		client.ExpectOutputEventDetaching(t)
	} else if cmd == "attach" {
		client.ExpectOutputEventDetachingKill(t)
	}
	client.ExpectDisconnectResponse(t)
	client.ExpectTerminatedEvent(t)
}

// runDebugSession is a helper for executing the standard init and shutdown
// sequences for a program that does not stop on entry
// while specifying unique launch criteria via parameters.
func runDebugSession(t *testing.T, client *daptest.Client, cmd string, cmdRequest func()) {
	runDebugSessionWithBPs(t, client, cmd, cmdRequest, "", nil, nil)
}

func TestLaunchDebugRequest(t *testing.T) {
	rescueStderr := os.Stderr
	r, w, _ := os.Pipe()
	os.Stderr = w
	done := make(chan struct{})

	var err []byte

	go func() {
		err, _ = ioutil.ReadAll(r)
		t.Log(string(err))
		close(done)
	}()

	tmpBin := "__tmpBin"
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// We reuse the harness that builds, but ignore the built binary,
		// only relying on the source to be built in response to LaunchRequest.
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source, "output": tmpBin})
		})
	})
	// Wait for the test to finish to capture all stderr
	time.Sleep(100 * time.Millisecond)

	w.Close()
	<-done
	os.Stderr = rescueStderr

	rmErrRe, _ := regexp.Compile(`could not remove .*\n`)
	rmErr := rmErrRe.FindString(string(err))
	if rmErr != "" {
		// On Windows, a file in use cannot be removed, resulting in "Access is denied".
		// When the process exits, Delve releases the binary by calling
		// BinaryInfo.Close(), but it appears that it is still in use (by Windows?)
		// shortly after. gobuild.Remove has a delay to address this, but
		// to avoid any test flakiness we guard against this failure here as well.
		if runtime.GOOS != "windows" || !stringContainsCaseInsensitive(rmErr, "Access is denied") {
			t.Fatalf("Binary removal failure:\n%s\n", rmErr)
		}
	} else {
		tmpBin = cleanExeName(tmpBin)
		// We did not get a removal error, but did we even try to remove before exiting?
		// Confirm that the binary did get removed.
		if _, err := os.Stat(tmpBin); err == nil || os.IsExist(err) {
			t.Fatal("Failed to remove temp binary", tmpBin)
		}
	}
}

// TestLaunchRequestDefaults tests defaults for launch attribute that are explicit in other tests.
func TestLaunchRequestDefaults(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "" /*"debug" by default*/, "program": fixture.Source, "output": "__mybin"})
		})
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				/*"mode":"debug" by default*/ "program": fixture.Source, "output": "__mybin"})
		})
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			// Use the temporary output binary.
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source})
		})
	})
}

// TestLaunchRequestOutputPath verifies that relative output binary path
// is mapped to server's, not target's, working directory.
func TestLaunchRequestOutputPath(t *testing.T) {
	runTest(t, "testargs", func(client *daptest.Client, fixture protest.Fixture) {
		inrel := "__somebin"
		wd, _ := os.Getwd()
		outabs := cleanExeName(filepath.Join(wd, inrel))
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "debug", "program": fixture.Source, "output": inrel,
					"cwd": filepath.Dir(wd)})
			},
			// Set breakpoints
			fixture.Source, []int{12},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 12)
					client.EvaluateRequest("os.Args[0]", 1000, "repl")
					checkEval(t, client.ExpectEvaluateResponse(t), fmt.Sprintf("%q", outabs), noChildren)
				},
				disconnect: true,
			}})
	})
}

func TestExitNonZeroStatus(t *testing.T) {
	runTest(t, "pr1055", func(client *daptest.Client, fixture protest.Fixture) {
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)

		client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
		client.ExpectInitializedEvent(t)
		client.ExpectLaunchResponse(t)

		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)

		client.ExpectTerminatedEvent(t)

		client.DisconnectRequest()
		// Check that the process exit status is 2.
		oep := client.ExpectOutputEventProcessExited(t, 2)
		if oep.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Category='console'", oep)
		}
		oed := client.ExpectOutputEventDetaching(t)
		if oed.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Category='console'", oed)
		}
		client.ExpectDisconnectResponse(t)
		client.ExpectTerminatedEvent(t)
	})
}

func TestNoDebug_GoodExitStatus(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runNoDebugSession(t, client, func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"noDebug": true, "mode": "debug", "program": fixture.Source, "output": "__mybin"})
		}, 0)
	})
}

func TestNoDebug_BadExitStatus(t *testing.T) {
	runTest(t, "issue1101", func(client *daptest.Client, fixture protest.Fixture) {
		runNoDebugSession(t, client, func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"noDebug": true, "mode": "exec", "program": fixture.Path})
		}, 2)
	})
}

// runNoDebugSession tests the session started with noDebug=true runs
// to completion and logs termination status.
func runNoDebugSession(t *testing.T, client *daptest.Client, launchRequest func(), exitStatus int) {
	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)

	launchRequest()
	// no initialized event.
	// noDebug mode applies only to "launch" requests.
	client.ExpectLaunchResponse(t)

	client.ExpectOutputEventProcessExited(t, exitStatus)
	client.ExpectTerminatedEvent(t)
	client.DisconnectRequestWithKillOption(true)
	client.ExpectDisconnectResponse(t)
	client.ExpectTerminatedEvent(t)
}

func TestNoDebug_AcceptNoRequestsButDisconnect(t *testing.T) {
	runTest(t, "http_server", func(client *daptest.Client, fixture protest.Fixture) {
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)
		client.LaunchRequestWithArgs(map[string]interface{}{
			"noDebug": true, "mode": "exec", "program": fixture.Path})
		client.ExpectLaunchResponse(t)

		// Anything other than disconnect should get rejected
		var ExpectNoDebugError = func(cmd string) {
			er := client.ExpectErrorResponse(t)
			if er.Body.Error.Format != fmt.Sprintf("noDebug mode: unable to process '%s' request", cmd) {
				t.Errorf("\ngot %#v\nwant 'noDebug mode: unable to process '%s' request'", er, cmd)
			}
		}
		client.SetBreakpointsRequest(fixture.Source, []int{8})
		ExpectNoDebugError("setBreakpoints")
		client.SetFunctionBreakpointsRequest(nil)
		ExpectNoDebugError("setFunctionBreakpoints")
		client.PauseRequest(1)
		ExpectNoDebugError("pause")
		client.RestartRequest()
		client.ExpectUnsupportedCommandErrorResponse(t)

		// Disconnect request is ok
		client.DisconnectRequestWithKillOption(true)
		terminated, disconnectResp := false, false
		for {
			m, err := client.ReadMessage()
			if err != nil {
				break
			}
			switch m := m.(type) {
			case *dap.OutputEvent:
				ok := false
				wants := []string{`Terminating process [0-9]+\n`, fmt.Sprintf(daptest.ProcessExited, "(-1|1)")}
				for _, want := range wants {
					if matched, _ := regexp.MatchString(want, m.Body.Output); matched {
						ok = true
						break
					}
				}
				if !ok {
					t.Errorf("\ngot %#v\nwant Output=%q\n", m, wants)
				}
			case *dap.TerminatedEvent:
				terminated = true
			case *dap.DisconnectResponse:
				disconnectResp = true
			default:
				t.Errorf("got unexpected message %#v", m)
			}
		}
		if !terminated {
			t.Errorf("did not get TerminatedEvent")
		}
		if !disconnectResp {
			t.Errorf("did not get DisconnectResponse")
		}
	})
}

func TestLaunchRequestWithRelativeBuildPath(t *testing.T) {
	serverStopped := make(chan struct{})
	client := startDAPServerWithClient(t, serverStopped)
	defer client.Close()

	fixdir := protest.FindFixturesDir()
	if filepath.IsAbs(fixdir) {
		t.Fatal("this test requires relative program path")
	}
	program := filepath.Join(protest.FindFixturesDir(), "buildtest")

	// Use different working dir for target than dlv.
	// Program path will be interpreted relative to dlv's.
	dlvwd, _ := os.Getwd()
	runDebugSession(t, client, "launch", func() {
		client.LaunchRequestWithArgs(map[string]interface{}{
			"mode": "debug", "program": program, "cwd": filepath.Dir(dlvwd)})
	})
	<-serverStopped
}

func TestLaunchRequestWithRelativeExecPath(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		symlink := "./__thisexe"
		err := os.Symlink(fixture.Path, symlink)
		defer os.Remove(symlink)
		if err != nil {
			t.Fatal("unable to create relative symlink:", err)
		}
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "exec", "program": symlink})
		})
	})
}

func TestLaunchTestRequest(t *testing.T) {
	orgWD, _ := os.Getwd()
	fixtures := protest.FindFixturesDir() // relative to current working directory.
	absoluteFixturesDir, _ := filepath.Abs(fixtures)
	absolutePkgDir, _ := filepath.Abs(filepath.Join(fixtures, "buildtest"))
	testFile := filepath.Join(absolutePkgDir, "main_test.go")

	for _, tc := range []struct {
		name       string
		dlvWD      string
		launchArgs map[string]interface{}
		wantWD     string
	}{{
		name: "default",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir,
		},
		wantWD: absolutePkgDir,
	}, {
		name: "output",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "output": "test.out",
		},
		wantWD: absolutePkgDir,
	}, {
		name: "dlvCwd",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "dlvCwd": ".",
		},
		wantWD: absolutePkgDir,
	}, {
		name: "dlvCwd2",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": ".", "dlvCwd": absolutePkgDir,
		},
		wantWD: absolutePkgDir,
	}, {
		name: "cwd",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "cwd": fixtures, // fixtures is relative to the current working directory.
		},
		wantWD: absoluteFixturesDir,
	}, {
		name:  "dlv runs outside of module",
		dlvWD: os.TempDir(),
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "dlvCwd": absoluteFixturesDir,
		},
		wantWD: absolutePkgDir,
	}, {
		name:  "dlv builds in dlvCwd but runs in cwd",
		dlvWD: fixtures,
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "dlvCwd": absolutePkgDir, "cwd": "..", // relative to dlvCwd.
		},
		wantWD: absoluteFixturesDir,
	}} {
		t.Run(tc.name, func(t *testing.T) {
			// Some test cases with dlvCwd or dlvWD change process working directory.
			defer os.Chdir(orgWD)
			if tc.dlvWD != "" {
				os.Chdir(tc.dlvWD)
				defer os.Chdir(orgWD)
			}
			serverStopped := make(chan struct{})
			client := startDAPServerWithClient(t, serverStopped)
			defer client.Close()

			runDebugSessionWithBPs(t, client, "launch",
				func() { // Launch
					client.LaunchRequestWithArgs(tc.launchArgs)
				},
				testFile, []int{14},
				[]onBreakpoint{{
					execute: func() {
						checkStop(t, client, -1, "github.com/undoio/delve/_fixtures/buildtest.TestCurrentDirectory", 14)
						client.VariablesRequest(1001) // Locals
						locals := client.ExpectVariablesResponse(t)
						checkChildren(t, locals, "Locals", 1)
						for i := range locals.Body.Variables {
							switch locals.Body.Variables[i].Name {
							case "wd": // The test's working directory is the package directory by default.
								checkVarExact(t, locals, i, "wd", "wd", fmt.Sprintf("%q", tc.wantWD), "string", noChildren)
							}
						}
					}}})

			<-serverStopped
		})
	}
}

// Tests that 'args' from LaunchRequest are parsed and passed to the target
// program. The target program exits without an error on success, and
// panics on error, causing an unexpected StoppedEvent instead of
// Terminated Event.
func TestLaunchRequestWithArgs(t *testing.T) {
	runTest(t, "testargs", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "exec", "program": fixture.Path,
				"args": []string{"test", "pass flag"}})
		})
	})
}

// Tests that 'buildFlags' from LaunchRequest are parsed and passed to the
// compiler. The target program exits without an error on success, and
// panics on error, causing an unexpected StoppedEvent instead of
// TerminatedEvent.
func TestLaunchRequestWithBuildFlags(t *testing.T) {
	runTest(t, "buildflagtest", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			// We reuse the harness that builds, but ignore the built binary,
			// only relying on the source to be built in response to LaunchRequest.
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source, "output": "__mybin",
				"buildFlags": "-ldflags '-X main.Hello=World'"})
		})
	})
}

func TestLaunchRequestWithEnv(t *testing.T) {
	// testenv fixture will lookup SOMEVAR with
	//   x, y := os.Lookup("SOMEVAR")
	// before stopping at runtime.Breakpoint.

	type envMap map[string]*string
	strVar := func(s string) *string { return &s }

	fixtures := protest.FindFixturesDir() // relative to current working directory.
	testFile, _ := filepath.Abs(filepath.Join(fixtures, "testenv.go"))
	for _, tc := range []struct {
		name      string
		initEnv   envMap
		launchEnv envMap
		wantX     string
		wantY     bool
	}{
		{
			name:    "no env",
			initEnv: envMap{"SOMEVAR": strVar("baz")},
			wantX:   "baz",
			wantY:   true,
		},
		{
			name:      "overwrite",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR": strVar("bar")},
			wantX:     "bar",
			wantY:     true,
		},
		{
			name:      "unset",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR": nil},
			wantX:     "",
			wantY:     false,
		},
		{
			name:      "empty value",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR": strVar("")},
			wantX:     "",
			wantY:     true,
		},
		{
			name:      "set",
			launchEnv: envMap{"SOMEVAR": strVar("foo")},
			wantX:     "foo",
			wantY:     true,
		},
		{
			name:      "untouched",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR2": nil, "SOMEVAR3": strVar("foo")},
			wantX:     "baz",
			wantY:     true,
		},
	} {

		t.Run(tc.name, func(t *testing.T) {
			// cleanup
			defer func() {
				os.Unsetenv("SOMEVAR")
				os.Unsetenv("SOMEVAR2")
				os.Unsetenv("SOMEVAR3")
			}()

			for k, v := range tc.initEnv {
				if v != nil {
					os.Setenv(k, *v)
				}
			}

			serverStopped := make(chan struct{})
			client := startDAPServerWithClient(t, serverStopped)
			defer client.Close()

			runDebugSessionWithBPs(t, client, "launch", func() { // launch
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode":    "debug",
					"program": testFile,
					"env":     tc.launchEnv,
				})
			}, testFile, nil, // runtime.Breakpoint
				[]onBreakpoint{{
					execute: func() {
						client.EvaluateRequest("x", 1000, "whatever")
						gotX := client.ExpectEvaluateResponse(t)
						checkEval(t, gotX, fmt.Sprintf("%q", tc.wantX), false)
						client.EvaluateRequest("y", 1000, "whatever")
						gotY := client.ExpectEvaluateResponse(t)
						checkEval(t, gotY, fmt.Sprintf("%v", tc.wantY), false)
					},
					disconnect: true,
				}})
			<-serverStopped
		})
	}
}

func TestAttachRequest(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.SkipNow()
	}
	if runtime.GOOS == "windows" {
		t.Skip("test skipped on windows, see https://delve.beta.teamcity.com/project/Delve_windows for details")
	}
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		// Start the program to attach to
		cmd := execFixture(t, fixture)

		runDebugSessionWithBPs(t, client, "attach",
			// Attach
			func() {
				client.AttachRequest(map[string]interface{}{
					/*"mode": "local" by default*/ "processId": cmd.Process.Pid, "stopOnEntry": false})
				client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
			},
			// Set breakpoints
			fixture.Source, []int{8},
			[]onBreakpoint{{
				// Stop at line 8
				execute: func() {
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 1)
					checkVarRegex(t, locals, 0, "i", "i", "[0-9]+", "int", noChildren)
				},
				disconnect: true,
			}})
	})
}

// Since we are in async mode while running, we might receive thee messages after pause request
// in either order.
func expectPauseResponseAndStoppedEvent(t *testing.T, client *daptest.Client) {
	t.Helper()
	for i := 0; i < 2; i++ {
		msg := client.ExpectMessage(t)
		switch m := msg.(type) {
		case *dap.StoppedEvent:
			if m.Body.Reason != "pause" || m.Body.ThreadId != 0 && m.Body.ThreadId != 1 {
				t.Errorf("\ngot %#v\nwant ThreadId=0/1 Reason='pause'", m)
			}
		case *dap.PauseResponse:
		default:
			t.Fatalf("got %#v, want StoppedEvent or PauseResponse", m)
		}
	}
}

func TestPauseAndContinue(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{6},
			[]onBreakpoint{{
				execute: func() {
					client.CheckStopLocation(t, 1, "main.loop", 6)

					// Continue resumes all goroutines, so thread id is ignored
					client.ContinueRequest(12345)
					client.ExpectContinueResponse(t)

					time.Sleep(time.Second)

					// Halt pauses all goroutines, so thread id is ignored
					client.PauseRequest(56789)
					expectPauseResponseAndStoppedEvent(t, client)

					// Pause will be a no-op at a pause: there will be no additional stopped events
					client.PauseRequest(1)
					client.ExpectPauseResponse(t)
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

func TestUnupportedCommandResponses(t *testing.T) {
	var got *dap.ErrorResponse
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		expectUnsupportedCommand := func(cmd string) {
			t.Helper()
			got = client.ExpectUnsupportedCommandErrorResponse(t)
			if got.RequestSeq != seqCnt || got.Command != cmd {
				t.Errorf("\ngot  %#v\nwant RequestSeq=%d Command=%s", got, seqCnt, cmd)
			}
			seqCnt++
		}

		client.RestartFrameRequest()
		expectUnsupportedCommand("restartFrame")

		client.GotoRequest()
		expectUnsupportedCommand("goto")

		client.SourceRequest()
		expectUnsupportedCommand("source")

		client.TerminateThreadsRequest()
		expectUnsupportedCommand("terminateThreads")

		client.StepInTargetsRequest()
		expectUnsupportedCommand("stepInTargets")

		client.GotoTargetsRequest()
		expectUnsupportedCommand("gotoTargets")

		client.CompletionsRequest()
		expectUnsupportedCommand("completions")

		client.DataBreakpointInfoRequest()
		expectUnsupportedCommand("dataBreakpointInfo")

		client.SetDataBreakpointsRequest()
		expectUnsupportedCommand("setDataBreakpoints")

		client.BreakpointLocationsRequest()
		expectUnsupportedCommand("breakpointLocations")

		client.ModulesRequest()
		expectUnsupportedCommand("modules")

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
	})
}

type helperForSetVariable struct {
	t *testing.T
	c *daptest.Client
}

func (h *helperForSetVariable) expectSetVariable(ref int, name, value string) {
	h.t.Helper()
	h.expectSetVariable0(ref, name, value, false)
}

func (h *helperForSetVariable) failSetVariable(ref int, name, value, wantErrInfo string) {
	h.t.Helper()
	h.failSetVariable0(ref, name, value, wantErrInfo, false)
}

func (h *helperForSetVariable) failSetVariableAndStop(ref int, name, value, wantErrInfo string) {
	h.t.Helper()
	h.failSetVariable0(ref, name, value, wantErrInfo, true)
}

func (h *helperForSetVariable) evaluate(expr, want string, hasRef bool) {
	h.t.Helper()
	h.c.EvaluateRequest(expr, 1000, "whatever")
	got := h.c.ExpectEvaluateResponse(h.t)
	checkEval(h.t, got, want, hasRef)
}

func (h *helperForSetVariable) evaluateRegex(expr, want string, hasRef bool) {
	h.t.Helper()
	h.c.EvaluateRequest(expr, 1000, "whatever")
	got := h.c.ExpectEvaluateResponse(h.t)
	checkEvalRegex(h.t, got, want, hasRef)
}

func (h *helperForSetVariable) expectSetVariable0(ref int, name, value string, wantStop bool) {
	h.t.Helper()

	h.c.SetVariableRequest(ref, name, value)
	if wantStop {
		h.c.ExpectStoppedEvent(h.t)
	}
	if got, want := h.c.ExpectSetVariableResponse(h.t), value; got.Success != true || got.Body.Value != want {
		h.t.Errorf("SetVariableRequest(%v, %v)=%#v, want {Success=true, Body.Value=%q", name, value, got, want)
	}
}

func (h *helperForSetVariable) failSetVariable0(ref int, name, value, wantErrInfo string, wantStop bool) {
	h.t.Helper()

	h.c.SetVariableRequest(ref, name, value)
	if wantStop {
		h.c.ExpectStoppedEvent(h.t)
	}
	resp := h.c.ExpectErrorResponse(h.t)
	if got := resp.Body.Error.Format; !stringContainsCaseInsensitive(got, wantErrInfo) {
		h.t.Errorf("got %#v, want error string containing %v", got, wantErrInfo)
	}
}

func (h *helperForSetVariable) variables(ref int) *dap.VariablesResponse {
	h.t.Helper()
	h.c.VariablesRequest(ref)
	return h.c.ExpectVariablesResponse(h.t)
}

// TestSetVariable tests SetVariable features that do not need function call support.
func TestSetVariable(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{}, // breakpoints are set within the program.
			[]onBreakpoint{{
				execute: func() {
					tester := &helperForSetVariable{t, client}

					startLineno := 66 // after runtime.Breakpoint
					if runtime.GOOS == "windows" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 15) {
						// Go1.15 on windows inserts a NOP after the call to
						// runtime.Breakpoint and marks it same line as the
						// runtime.Breakpoint call, making this flaky, so skip the line check.
						startLineno = -1
					}

					checkStop(t, client, 1, "main.foobar", startLineno)

					// Local variables
					locals := tester.variables(localsScope)

					// Args of foobar(baz string, bar FooBar)
					checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					tester.failSetVariable(localsScope, "bar", `main.FooBar {Baz: 42, Bur: "ipsum"}`, "*ast.CompositeLit not implemented")

					// Nested field.
					barRef := checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(barRef, "Baz", "42")
					tester.evaluate("bar", `main.FooBar {Baz: 42, Bur: "lorem"}`, hasChildren)

					tester.failSetVariable(barRef, "Baz", `"string"`, "can not convert")

					// int
					checkVarExact(t, locals, -1, "a2", "a2", "6", "int", noChildren)
					tester.expectSetVariable(localsScope, "a2", "42")
					tester.evaluate("a2", "42", noChildren)

					tester.failSetVariable(localsScope, "a2", "false", "can not convert")

					// float
					checkVarExact(t, locals, -1, "a3", "a3", "7.23", "float64", noChildren)
					tester.expectSetVariable(localsScope, "a3", "-0.1")
					tester.evaluate("a3", "-0.1", noChildren)

					// array of int
					a4Ref := checkVarExact(t, locals, -1, "a4", "a4", "[2]int [1,2]", "[2]int", hasChildren)
					tester.expectSetVariable(a4Ref, "[1]", "-7")
					tester.evaluate("a4", "[2]int [1,-7]", hasChildren)

					tester.failSetVariable(localsScope, "a4", "[2]int{3, 4}", "not implemented")

					// slice of int
					a5Ref := checkVarExact(t, locals, -1, "a5", "a5", "[]int len: 5, cap: 5, [1,2,3,4,5]", "[]int", hasChildren)
					tester.expectSetVariable(a5Ref, "[3]", "100")
					tester.evaluate("a5", "[]int len: 5, cap: 5, [1,2,3,100,5]", hasChildren)

					// composite literal and its nested fields.
					a7Ref := checkVarExact(t, locals, -1, "a7", "a7", `*main.FooBar {Baz: 5, Bur: "strum"}`, "*main.FooBar", hasChildren)
					a7Val := tester.variables(a7Ref)
					a7ValRef := checkVarExact(t, a7Val, -1, "", "(*a7)", `main.FooBar {Baz: 5, Bur: "strum"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(a7ValRef, "Baz", "7")
					tester.evaluate("(*a7)", `main.FooBar {Baz: 7, Bur: "strum"}`, hasChildren)

					// pointer
					checkVarExact(t, locals, -1, "a9", "a9", `*main.FooBar nil`, "*main.FooBar", noChildren)
					tester.expectSetVariable(localsScope, "a9", "&a6")
					tester.evaluate("a9", `*main.FooBar {Baz: 8, Bur: "word"}`, hasChildren)

					// slice of pointers
					a13Ref := checkVarExact(t, locals, -1, "a13", "a13", `[]*main.FooBar len: 3, cap: 3, [*{Baz: 6, Bur: "f"},*{Baz: 7, Bur: "g"},*{Baz: 8, Bur: "h"}]`, "[]*main.FooBar", hasChildren)
					a13 := tester.variables(a13Ref)
					a13c0Ref := checkVarExact(t, a13, -1, "[0]", "a13[0]", `*main.FooBar {Baz: 6, Bur: "f"}`, "*main.FooBar", hasChildren)
					a13c0 := tester.variables(a13c0Ref)
					a13c0valRef := checkVarExact(t, a13c0, -1, "", "(*a13[0])", `main.FooBar {Baz: 6, Bur: "f"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(a13c0valRef, "Baz", "777")
					tester.evaluate("a13[0]", `*main.FooBar {Baz: 777, Bur: "f"}`, hasChildren)

					// complex
					tester.evaluate("c64", `(1 + 2i)`, hasChildren)
					tester.expectSetVariable(localsScope, "c64", "(2 + 3i)")
					tester.evaluate("c64", `(2 + 3i)`, hasChildren)
					// note: complex's real, imaginary part can't be directly mutable.

					//
					// Global variables
					//    p1 = 10
					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)

					checkVarExact(t, globals, -1, "p1", "main.p1", "10", "int", noChildren)
					tester.expectSetVariable(globalsScope, "p1", "-10")
					tester.evaluate("p1", "-10", noChildren)
					tester.failSetVariable(globalsScope, "p1", "0.1", "can not convert")
				},
				disconnect: true,
			}})
	})

	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{}, // breakpoints are set within the program.
			[]onBreakpoint{{
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.main", -1)
					locals := tester.variables(localsScope)

					// channel
					tester.evaluate("chnil", "chan int nil", noChildren)
					tester.expectSetVariable(localsScope, "chnil", "ch1")
					tester.evaluate("chnil", "chan int 4/11", hasChildren)

					// func
					tester.evaluate("fn2", "nil", noChildren)
					tester.expectSetVariable(localsScope, "fn2", "fn1")
					tester.evaluate("fn2", "main.afunc", noChildren)

					// interface
					tester.evaluate("ifacenil", "interface {} nil", noChildren)
					tester.expectSetVariable(localsScope, "ifacenil", "iface1")
					tester.evaluate("ifacenil", "interface {}(*main.astruct) *{A: 1, B: 2}", hasChildren)

					// interface.(data)
					iface1Ref := checkVarExact(t, locals, -1, "iface1", "iface1", "interface {}(*main.astruct) *{A: 1, B: 2}", "interface {}", hasChildren)
					iface1 := tester.variables(iface1Ref)
					iface1DataRef := checkVarExact(t, iface1, -1, "data", "iface1.(data)", "*main.astruct {A: 1, B: 2}", "*main.astruct", hasChildren)
					iface1Data := tester.variables(iface1DataRef)
					iface1DataValueRef := checkVarExact(t, iface1Data, -1, "", "(*iface1.(data))", "main.astruct {A: 1, B: 2}", "main.astruct", hasChildren)
					tester.expectSetVariable(iface1DataValueRef, "A", "2021")
					tester.evaluate("iface1", "interface {}(*main.astruct) *{A: 2021, B: 2}", hasChildren)

					// map: string -> struct
					tester.evaluate(`m1["Malone"]`, "main.astruct {A: 2, B: 3}", hasChildren)
					m1Ref := checkVarRegex(t, locals, -1, "m1", "m1", `.*map\[string\]main\.astruct.*`, `map\[string\]main\.astruct`, hasChildren)
					m1 := tester.variables(m1Ref)
					elem1 := m1.Body.Variables[1]
					tester.expectSetVariable(elem1.VariablesReference, "A", "-9999")
					tester.expectSetVariable(elem1.VariablesReference, "B", "10000")
					tester.evaluate(elem1.EvaluateName, "main.astruct {A: -9999, B: 10000}", hasChildren)

					// map: struct -> int
					m3Ref := checkVarExact(t, locals, -1, "m3", "m3", "map[main.astruct]int [{A: 1, B: 1}: 42, {A: 2, B: 2}: 43, ]", "map[main.astruct]int", hasChildren)
					tester.expectSetVariable(m3Ref, "main.astruct {A: 1, B: 1}", "8888")
					// note: updating keys is possible, but let's not promise anything.
					tester.evaluateRegex("m3", `.*\[\{A: 1, B: 1\}: 8888,.*`, hasChildren)

					// map: struct -> struct
					m4Ref := checkVarRegex(t, locals, -1, "m4", "m4", `map\[main\.astruct]main\.astruct.*\[\{A: 1, B: 1\}: \{A: 11, B: 11\}.*`, `map\[main\.astruct\]main\.astruct`, hasChildren)
					m4 := tester.variables(m4Ref)
					m4Val1Ref := checkVarRegex(t, m4, -1, "[val 0]", `.*0x[0-9a-f]+.*`, `main.astruct.*`, `main\.astruct`, hasChildren)
					tester.expectSetVariable(m4Val1Ref, "A", "-9999")
					tester.evaluateRegex("m4", `.*A: -9999,.*`, hasChildren)

					// unsigned pointer
					checkVarRegex(t, locals, -1, "up1", "up1", `unsafe\.Pointer\(0x[0-9a-f]+\)`, "unsafe.Pointer", noChildren)
					tester.expectSetVariable(localsScope, "up1", "unsafe.Pointer(0x0)")
					tester.evaluate("up1", "unsafe.Pointer(0x0)", noChildren)

					// val := A{val: 1}
					valRef := checkVarExact(t, locals, -1, "val", "val", `main.A {val: 1}`, "main.A", hasChildren)
					tester.expectSetVariable(valRef, "val", "3")
					tester.evaluate("val", `main.A {val: 3}`, hasChildren)
				},
				disconnect: true,
			}})
	})
}

// TestSetVariableWithCall tests SetVariable features that do not depend on function calls support.
func TestSetVariableWithCall(t *testing.T) {
	protest.MustSupportFunctionCalls(t, testBackend)

	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{66, 67},
			[]onBreakpoint{{
				execute: func() {
					tester := &helperForSetVariable{t, client}

					startLineno := 66
					if runtime.GOOS == "windows" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 15) {
						// Go1.15 on windows inserts a NOP after the call to
						// runtime.Breakpoint and marks it same line as the
						// runtime.Breakpoint call, making this flaky, so skip the line check.
						startLineno = -1
					}

					checkStop(t, client, 1, "main.foobar", startLineno)

					// Local variables
					locals := tester.variables(localsScope)

					// Args of foobar(baz string, bar FooBar)
					checkVarExact(t, locals, 0, "baz", "baz", `"bazburzum"`, "string", noChildren)
					tester.expectSetVariable(localsScope, "baz", `"BazBurZum"`)
					tester.evaluate("baz", `"BazBurZum"`, noChildren)

					barRef := checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(barRef, "Bur", `"ipsum"`)
					tester.evaluate("bar", `main.FooBar {Baz: 10, Bur: "ipsum"}`, hasChildren)

					checkVarExact(t, locals, -1, "a1", "a1", `"foofoofoofoofoofoo"`, "string", noChildren)
					tester.expectSetVariable(localsScope, "a1", `"barbarbar"`)
					tester.evaluate("a1", `"barbarbar"`, noChildren)

					a6Ref := checkVarExact(t, locals, -1, "a6", "a6", `main.FooBar {Baz: 8, Bur: "word"}`, "main.FooBar", hasChildren)
					tester.failSetVariable(a6Ref, "Bur", "false", "can not convert")

					tester.expectSetVariable(a6Ref, "Bur", `"sentence"`)
					tester.evaluate("a6", `main.FooBar {Baz: 8, Bur: "sentence"}`, hasChildren)
				},
			}, {
				// Stop at second breakpoint and set a1.
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.barfoo", -1)
					// Test: set string 'a1' in main.barfoo.
					// This shouldn't affect 'a1' in main.foobar - we will check that in the next breakpoint.
					locals := tester.variables(localsScope)
					checkVarExact(t, locals, -1, "a1", "a1", `"bur"`, "string", noChildren)
					tester.expectSetVariable(localsScope, "a1", `"fur"`)
					tester.evaluate("a1", `"fur"`, noChildren)
					// We will check a1 in main.foobar isn't affected from the next breakpoint.

					client.StackTraceRequest(1, 1, 20)
					res := client.ExpectStackTraceResponse(t)
					if len(res.Body.StackFrames) < 1 {
						t.Fatalf("stack trace response = %#v, wanted at least one stack frame", res)
					}
					outerFrame := res.Body.StackFrames[0].Id
					client.EvaluateRequest("a1", outerFrame, "whatever_context")
					evalRes := client.ExpectEvaluateResponse(t)
					checkEval(t, evalRes, `"barbarbar"`, noChildren)
				},
				disconnect: true,
			}})
	})

	runTest(t, "fncall", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{}, // breakpoints are set within the program.
			[]onBreakpoint{{
				// Stop at second breakpoint and set a1.
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.main", -1)

					_ = tester.variables(localsScope)

					// successful variable set using a function call.
					tester.expectSetVariable(localsScope, "str", `callstacktrace()`)
					tester.evaluateRegex("str", `.*in main.callstacktrace at.*`, noChildren)

					tester.failSetVariableAndStop(localsScope, "str", `callpanic()`, `callpanic panicked`)
					checkStop(t, client, 1, "main.main", -1)

					// breakpoint during a function call.
					tester.failSetVariableAndStop(localsScope, "str", `callbreak()`, "call stopped")

					// TODO(hyangah): continue after this causes runtime error while resuming
					// unfinished injected call.
					//   runtime error: can not convert %!s(<nil>) constant to string
					// This can be reproducible with dlv cli. (`call str = callbreak(); continue`)
				},
				disconnect: true,
			}})
	})
}

func TestOptionalNotYetImplementedResponses(t *testing.T) {
	var got *dap.ErrorResponse
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		expectNotYetImplemented := func(cmd string) {
			t.Helper()
			got = client.ExpectNotYetImplementedErrorResponse(t)
			if got.RequestSeq != seqCnt || got.Command != cmd {
				t.Errorf("\ngot  %#v\nwant RequestSeq=%d Command=%s", got, seqCnt, cmd)
			}
			seqCnt++
		}

		client.TerminateRequest()
		expectNotYetImplemented("terminate")

		client.RestartRequest()
		expectNotYetImplemented("restart")

		client.SetExpressionRequest()
		expectNotYetImplemented("setExpression")

		client.LoadedSourcesRequest()
		expectNotYetImplemented("loadedSources")

		client.ReadMemoryRequest()
		expectNotYetImplemented("readMemory")

		client.CancelRequest()
		expectNotYetImplemented("cancel")

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
	})
}

func TestBadLaunchRequests(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		checkFailedToLaunch := func(response *dap.ErrorResponse) {
			t.Helper()
			if response.RequestSeq != seqCnt {
				t.Errorf("RequestSeq got %d, want %d", seqCnt, response.RequestSeq)
			}
			if response.Command != "launch" {
				t.Errorf("Command got %q, want \"launch\"", response.Command)
			}
			if response.Message != "Failed to launch" {
				t.Errorf("Message got %q, want \"Failed to launch\"", response.Message)
			}
			if response.Body.Error.Id != FailedToLaunch {
				t.Errorf("Id got %d, want %d", response.Body.Error.Id, FailedToLaunch)
			}
			seqCnt++
		}

		checkFailedToLaunchWithMessage := func(response *dap.ErrorResponse, errmsg string) {
			t.Helper()
			checkFailedToLaunch(response)
			if response.Body.Error.Format != errmsg {
				t.Errorf("\ngot  %q\nwant %q", response.Body.Error.Format, errmsg)
			}
		}

		// Test for the DAP-specific detailed error message.
		client.LaunchRequest("exec", "", stopOnEntry)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		// Bad "program"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": 12345})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"program\" of type string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": nil})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		// Bad "mode"
		client.LaunchRequest("remote", fixture.Path, stopOnEntry)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - unsupported 'mode' attribute \"remote\"")

		client.LaunchRequest("notamode", fixture.Path, stopOnEntry)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - unsupported 'mode' attribute \"notamode\"")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": 12345, "program": fixture.Path})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"mode\" of type string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": ""}) // empty mode defaults to "debug" (not an error)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		client.LaunchRequestWithArgs(map[string]interface{}{}) // missing mode defaults to "debug" (not an error)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		// Bad "args"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": "foobar"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal string into \"args\" of type []string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": 12345})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"args\" of type []string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": []int{1, 2}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"args\" of type string")

		// Bad "buildFlags"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "buildFlags": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"buildFlags\" of type string")

		// Bad "backend"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "backend": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"backend\" of type string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "backend": "foo"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: could not launch process: unknown backend \"foo\"")

		// Bad "substitutePath"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"substitutePath\" of type {\"from\":string, \"to\":string}")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": []interface{}{123}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot use 123 as 'substitutePath' of type {\"from\":string, \"to\":string}")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": []interface{}{map[string]interface{}{"to": "path2"}}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - 'substitutePath' requires both 'from' and 'to' entries")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": []interface{}{map[string]interface{}{"from": "path1", "to": 123}}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot use {\"from\":\"path1\",\"to\":123} as 'substitutePath' of type {\"from\":string, \"to\":string}")
		// Bad "cwd"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "cwd": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"cwd\" of type string")

		// Skip detailed message checks for potentially different OS-specific errors.
		client.LaunchRequest("exec", fixture.Path+"_does_not_exist", stopOnEntry)
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // No such file or directory

		client.LaunchRequest("debug", fixture.Path+"_does_not_exist", stopOnEntry)
		oe := client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunch(client.ExpectInvisibleErrorResponse(t))

		client.LaunchRequestWithArgs(map[string]interface{}{
			"request": "launch",
			/* mode: debug by default*/
			"program":     fixture.Path + "_does_not_exist",
			"stopOnEntry": stopOnEntry,
		})
		oe = client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunch(client.ExpectInvisibleErrorResponse(t))

		client.LaunchRequest("exec", fixture.Source, stopOnEntry)
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // Not an executable

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "buildFlags": "-bad -flags"})
		oe = client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunchWithMessage(client.ExpectInvisibleErrorResponse(t), "Failed to launch: Build error: Check the debug console for details.")
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": true, "buildFlags": "-bad -flags"})
		oe = client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunchWithMessage(client.ExpectInvisibleErrorResponse(t), "Failed to launch: Build error: Check the debug console for details.")

		// Bad "cwd"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": false, "cwd": "dir/invalid"})
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // invalid directory, the error message is system-dependent.
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": true, "cwd": "dir/invalid"})
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // invalid directory, the error message is system-dependent.

		// Bad "noDebug"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": "true"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t), "Failed to launch: invalid debug configuration - cannot unmarshal string into \"noDebug\" of type bool")

		// Bad "replay" parameters
		// These errors come from dap layer
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "replay", "traceDirPath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The 'traceDirPath' attribute is missing in debug configuration.")
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "replay", "program": fixture.Source, "traceDirPath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The 'traceDirPath' attribute is missing in debug configuration.")
		// These errors come from debugger layer
		if _, err := exec.LookPath("rr"); err != nil {
			client.LaunchRequestWithArgs(map[string]interface{}{"mode": "replay", "backend": "ignored", "traceDirPath": ".."})
			checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
				"Failed to launch: backend unavailable")
		}

		// Bad "core" parameters
		// These errors come from dap layer
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "core", "coreFilePath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "core", "program": fixture.Source, "coreFilePath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The 'coreFilePath' attribute is missing in debug configuration.")
		// These errors come from debugger layer
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "core", "backend": "ignored", "program": fixture.Source, "coreFilePath": fixture.Source})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: unrecognized core format")

		// We failed to launch the program. Make sure shutdown still works.
		client.DisconnectRequest()
		dresp := client.ExpectDisconnectResponse(t)
		if dresp.RequestSeq != seqCnt {
			t.Errorf("got %#v, want RequestSeq=%d", dresp, seqCnt)
		}
	})
}

func TestBadAttachRequest(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		checkFailedToAttach := func(response *dap.ErrorResponse) {
			t.Helper()
			if response.RequestSeq != seqCnt {
				t.Errorf("RequestSeq got %d, want %d", seqCnt, response.RequestSeq)
			}
			if response.Command != "attach" {
				t.Errorf("Command got %q, want \"attach\"", response.Command)
			}
			if response.Message != "Failed to attach" {
				t.Errorf("Message got %q, want \"Failed to attach\"", response.Message)
			}
			if response.Body.Error.Id != FailedToAttach {
				t.Errorf("Id got %d, want %d", response.Body.Error.Id, FailedToAttach)
			}
			seqCnt++
		}

		checkFailedToAttachWithMessage := func(response *dap.ErrorResponse, errmsg string) {
			t.Helper()
			checkFailedToAttach(response)
			if response.Body.Error.Format != errmsg {
				t.Errorf("\ngot  %q\nwant %q", response.Body.Error.Format, errmsg)
			}
		}

		// Bad "mode"
		client.AttachRequest(map[string]interface{}{"mode": "blah blah blah"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - unsupported 'mode' attribute \"blah blah blah\"")

		client.AttachRequest(map[string]interface{}{"mode": 123})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - cannot unmarshal number into \"mode\" of type string")

		client.AttachRequest(map[string]interface{}{"mode": ""}) // empty mode defaults to "local" (not an error)
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{}) // no mode defaults to "local" (not an error)
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' attribute is missing in debug configuration")

		// Bad "processId"
		client.AttachRequest(map[string]interface{}{"mode": "local"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": nil})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 0})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": "1"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - cannot unmarshal string into \"processId\" of type int")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1})
		// The exact message varies on different systems, so skip that check
		checkFailedToAttach(client.ExpectVisibleErrorResponse(t)) // could not attach to pid 1

		// This will make debugger.(*Debugger) panic, which we will catch as an internal error.
		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": -1})
		er := client.ExpectInvisibleErrorResponse(t)
		if er.RequestSeq != seqCnt {
			t.Errorf("RequestSeq got %d, want %d", seqCnt, er.RequestSeq)
		}
		seqCnt++
		if er.Command != "" {
			t.Errorf("Command got %q, want \"attach\"", er.Command)
		}
		if er.Body.Error.Format != "Internal Error: runtime error: index out of range [0] with length 0" {
			t.Errorf("Message got %q, want \"Internal Error: runtime error: index out of range [0] with length 0\"", er.Message)
		}
		if er.Body.Error.Id != InternalError {
			t.Errorf("Id got %d, want %d", er.Body.Error.Id, InternalError)
		}

		// Bad "backend"
		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1, "backend": 123})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - cannot unmarshal number into \"backend\" of type string")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1, "backend": "foo"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: could not attach to pid 1: unknown backend \"foo\"")

		// We failed to attach to the program. Make sure shutdown still works.
		client.DisconnectRequest()
		dresp := client.ExpectDisconnectResponse(t)
		if dresp.RequestSeq != seqCnt {
			t.Errorf("got %#v, want RequestSeq=%d", dresp, seqCnt)
		}
	})
}

func launchDebuggerWithTargetRunning(t *testing.T, fixture string) (*protest.Fixture, *debugger.Debugger) {
	t.Helper()
	fixbin, dbg := launchDebuggerWithTargetHalted(t, fixture)
	running := make(chan struct{})
	var err error
	go func() {
		t.Helper()
		_, err = dbg.Command(&api.DebuggerCommand{Name: api.Continue}, running)
		select {
		case <-running:
		default:
			close(running)
		}
	}()
	<-running
	if err != nil {
		t.Fatal("failed to continue on launch", err)
	}
	return fixbin, dbg
}

func launchDebuggerWithTargetHalted(t *testing.T, fixture string) (*protest.Fixture, *debugger.Debugger) {
	t.Helper()
	fixbin := protest.BuildFixture(fixture, protest.AllNonOptimized)
	cfg := service.Config{
		ProcessArgs: []string{fixbin.Path},
		Debugger:    debugger.Config{Backend: "default"},
	}
	dbg, err := debugger.New(&cfg.Debugger, cfg.ProcessArgs) // debugger halts process on entry
	if err != nil {
		t.Fatal("failed to start debugger:", err)
	}
	return &fixbin, dbg
}

func attachDebuggerWithTargetHalted(t *testing.T, fixture string) (*exec.Cmd, *debugger.Debugger) {
	t.Helper()
	fixbin := protest.BuildFixture(fixture, protest.AllNonOptimized)
	cmd := execFixture(t, fixbin)
	cfg := service.Config{Debugger: debugger.Config{Backend: "default", AttachPid: cmd.Process.Pid}}
	dbg, err := debugger.New(&cfg.Debugger, nil) // debugger halts process on entry
	if err != nil {
		t.Fatal("failed to start debugger:", err)
	}
	return cmd, dbg
}

// runTestWithDebugger starts the server and sets its debugger, initializes a debug session,
// runs test, then disconnects. Expects no running async handler at the end of test() (either
// process is halted or debug session never launched.)
func runTestWithDebugger(t *testing.T, dbg *debugger.Debugger, test func(c *daptest.Client)) {
	serverStopped := make(chan struct{})
	server, _ := startDAPServer(t, serverStopped)
	client := daptest.NewClient(server.listener.Addr().String())
	time.Sleep(100 * time.Millisecond) // Give time for connection to be set as dap.Session
	server.sessionMu.Lock()
	if server.session == nil {
		t.Fatal("DAP session is not ready")
	}
	// Mock dap.NewSession arguments, so
	// this dap.Server can be used as a proxy for
	// rpccommon.Server running dap.Session.
	server.session.config.Debugger.AttachPid = dbg.AttachPid()
	server.session.debugger = dbg
	server.sessionMu.Unlock()
	defer client.Close()
	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)

	test(client)

	client.DisconnectRequest()
	if dbg.AttachPid() == 0 { // launched target
		client.ExpectOutputEventDetachingKill(t)
	} else { // attached to target
		client.ExpectOutputEventDetachingNoKill(t)
	}
	client.ExpectDisconnectResponse(t)
	client.ExpectTerminatedEvent(t)

	<-serverStopped
}

func TestAttachRemoteToDlvLaunchHaltedStopOnEntry(t *testing.T) {
	// Halted + stop on entry
	_, dbg := launchDebuggerWithTargetHalted(t, "increment")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.ConfigurationDoneRequest()
		client.ExpectStoppedEvent(t)
		client.ExpectConfigurationDoneResponse(t)
	})
}

func TestAttachRemoteToDlvAttachHaltedStopOnEntry(t *testing.T) {
	if runtime.GOOS == "freebsd" || runtime.GOOS == "windows" {
		t.SkipNow()
	}
	cmd, dbg := attachDebuggerWithTargetHalted(t, "http_server")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
		client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.ConfigurationDoneRequest()
		client.ExpectStoppedEvent(t)
		client.ExpectConfigurationDoneResponse(t)
	})
	cmd.Process.Kill()
}

func TestAttachRemoteToHaltedTargetContinueOnEntry(t *testing.T) {
	// Halted + continue on entry
	_, dbg := launchDebuggerWithTargetHalted(t, "http_server")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": false})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)
		// Continuing
		time.Sleep(time.Second)
		// Halt to make the disconnect sequence more predictable.
		client.PauseRequest(1)
		expectPauseResponseAndStoppedEvent(t, client)
	})
}

func TestAttachRemoteToRunningTargetStopOnEntry(t *testing.T) {
	fixture, dbg := launchDebuggerWithTargetRunning(t, "loopprog")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		// Target is halted here
		client.SetBreakpointsRequest(fixture.Source, []int{8})
		expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})
		client.ConfigurationDoneRequest()
		client.ExpectStoppedEvent(t)
		client.ExpectConfigurationDoneResponse(t)
		client.ContinueRequest(1)
		client.ExpectContinueResponse(t)
		client.ExpectStoppedEvent(t)
		checkStop(t, client, 1, "main.loop", 8)
	})
}

func TestAttachRemoteToRunningTargetContinueOnEntry(t *testing.T) {
	fixture, dbg := launchDebuggerWithTargetRunning(t, "loopprog")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": false})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		// Target is halted here
		client.SetBreakpointsRequest(fixture.Source, []int{8})
		expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})
		client.ConfigurationDoneRequest()
		// Target is restarted here
		client.ExpectConfigurationDoneResponse(t)
		client.ExpectStoppedEvent(t)
		checkStop(t, client, 1, "main.loop", 8)
	})
}

// MultiClientCloseServerMock mocks the rpccommon.Server using a dap.Server to exercise
// the shutdown logic in dap.Session where it does NOT take down the server on close
// in multi-client mode. (The dap mode of the rpccommon.Server is tested in dlv_test).
// The dap.Server is a single-use server. Once its one and only session is closed,
// the server and the target must be taken down manually for the test not to leak.
type MultiClientCloseServerMock struct {
	impl      *Server
	debugger  *debugger.Debugger
	forceStop chan struct{}
	stopped   chan struct{}
}

func NewMultiClientCloseServerMock(t *testing.T, fixture string) *MultiClientCloseServerMock {
	var s MultiClientCloseServerMock
	s.stopped = make(chan struct{})
	s.impl, s.forceStop = startDAPServer(t, s.stopped)
	_, s.debugger = launchDebuggerWithTargetHalted(t, "http_server")
	return &s
}

func (s *MultiClientCloseServerMock) acceptNewClient(t *testing.T) *daptest.Client {
	client := daptest.NewClient(s.impl.listener.Addr().String())
	time.Sleep(100 * time.Millisecond) // Give time for connection to be set as dap.Session
	s.impl.sessionMu.Lock()
	if s.impl.session == nil {
		t.Fatal("dap session is not ready")
	}
	// A dap.Server doesn't support accept-multiclient, but we can use this
	// hack to test the inner connection logic that is used by a server that does.
	s.impl.session.config.AcceptMulti = true
	s.impl.session.debugger = s.debugger
	s.impl.sessionMu.Unlock()
	return client
}

func (s *MultiClientCloseServerMock) stop(t *testing.T) {
	close(s.forceStop)
	// If the server doesn't have an active session,
	// closing it would leak the debbuger with the target because
	// they are part of dap.Session.
	// We must take it down manually as if we are in rpccommon::ServerImpl::Stop.
	if s.debugger.IsRunning() {
		s.debugger.Command(&api.DebuggerCommand{Name: api.Halt}, nil)
	}
	s.debugger.Detach(true)
}

func (s *MultiClientCloseServerMock) verifyStopped(t *testing.T) {
	if state, err := s.debugger.State(true /*nowait*/); err != proc.ErrProcessDetached && !processExited(state, err) {
		t.Errorf("target leak")
	}
	verifyServerStopped(t, s.impl)
}

// TestAttachRemoteMultiClientDisconnect tests that that remote attach doesn't take down
// the server in multi-client mode unless terminateDebuggee is explicitely set.
func TestAttachRemoteMultiClientDisconnect(t *testing.T) {
	closingClientSessionOnly := fmt.Sprintf(daptest.ClosingClient, "halted")
	detachingAndTerminating := "Detaching and terminating target process"
	tests := []struct {
		name              string
		disconnectRequest func(client *daptest.Client)
		expect            string
	}{
		{"default", func(c *daptest.Client) { c.DisconnectRequest() }, closingClientSessionOnly},
		{"terminate=true", func(c *daptest.Client) { c.DisconnectRequestWithKillOption(true) }, detachingAndTerminating},
		{"terminate=false", func(c *daptest.Client) { c.DisconnectRequestWithKillOption(false) }, closingClientSessionOnly},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			server := NewMultiClientCloseServerMock(t, "increment")
			client := server.acceptNewClient(t)
			defer client.Close()

			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)

			client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
			client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
			client.ExpectInitializedEvent(t)
			client.ExpectAttachResponse(t)
			client.ConfigurationDoneRequest()
			client.ExpectStoppedEvent(t)
			client.ExpectConfigurationDoneResponse(t)

			tc.disconnectRequest(client)
			e := client.ExpectOutputEvent(t)
			if matched, _ := regexp.MatchString(tc.expect, e.Body.Output); !matched {
				t.Errorf("\ngot %#v\nwant Output=%q", e, tc.expect)
			}
			client.ExpectDisconnectResponse(t)
			client.ExpectTerminatedEvent(t)
			time.Sleep(10 * time.Millisecond) // give time for things to shut down

			if tc.expect == closingClientSessionOnly {
				// At this point a multi-client server is still running. but session should be done.
				verifySessionStopped(t, server.impl.session)
				// Verify target's running state.
				if server.debugger.IsRunning() {
					t.Errorf("\ngot running=true, want false")
				}
				server.stop(t)
			}
			<-server.stopped
			server.verifyStopped(t)
		})
	}
}

func TestLaunchAttachErrorWhenDebugInProgress(t *testing.T) {
	tests := []struct {
		name string
		dbg  func() *debugger.Debugger
	}{
		{"halted", func() *debugger.Debugger { _, dbg := launchDebuggerWithTargetHalted(t, "increment"); return dbg }},
		{"running", func() *debugger.Debugger { _, dbg := launchDebuggerWithTargetRunning(t, "loopprog"); return dbg }},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			runTestWithDebugger(t, tc.dbg(), func(client *daptest.Client) {
				client.EvaluateRequest("1==1", 0 /*no frame specified*/, "repl")
				if tc.name == "running" {
					client.ExpectInvisibleErrorResponse(t)
				} else {
					client.ExpectEvaluateResponse(t)
				}

				// Both launch and attach requests should go through for additional error checking
				client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 100})
				er := client.ExpectVisibleErrorResponse(t)
				msgRe, _ := regexp.Compile("Failed to attach: debug session already in progress at [0-9]+:[0-9]+ - use remote mode to connect to a server with an active debug session")
				if er.Body.Error.Id != FailedToAttach || msgRe.MatchString(er.Body.Error.Format) {
					t.Errorf("got %#v, want Id=%d Format=%q", er, FailedToAttach, msgRe)
				}
				tests := []string{"debug", "test", "exec", "replay", "core"}
				for _, mode := range tests {
					t.Run(mode, func(t *testing.T) {
						client.LaunchRequestWithArgs(map[string]interface{}{"mode": mode})
						er := client.ExpectVisibleErrorResponse(t)
						msgRe, _ := regexp.Compile("Failed to launch: debug session already in progress at [0-9]+:[0-9]+ - use remote attach mode to connect to a server with an active debug session")
						if er.Body.Error.Id != FailedToLaunch || msgRe.MatchString(er.Body.Error.Format) {
							t.Errorf("got %#v, want Id=%d Format=%q", er, FailedToLaunch, msgRe)
						}
					})
				}
			})
		})
	}
}

func TestBadInitializeRequest(t *testing.T) {
	runInitializeTest := func(args dap.InitializeRequestArguments, err string) {
		t.Helper()
		// Only one initialize request is allowed, so use a new server
		// for each test.
		serverStopped := make(chan struct{})
		client := startDAPServerWithClient(t, serverStopped)
		defer client.Close()

		client.InitializeRequestWithArgs(args)
		response := client.ExpectErrorResponse(t)
		if response.Command != "initialize" {
			t.Errorf("Command got %q, want \"launch\"", response.Command)
		}
		if response.Message != "Failed to initialize" {
			t.Errorf("Message got %q, want \"Failed to launch\"", response.Message)
		}
		if response.Body.Error.Id != FailedToInitialize {
			t.Errorf("Id got %d, want %d", response.Body.Error.Id, FailedToInitialize)
		}
		if response.Body.Error.Format != err {
			t.Errorf("\ngot  %q\nwant %q", response.Body.Error.Format, err)
		}

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
		<-serverStopped
	}

	// Bad path format.
	runInitializeTest(dap.InitializeRequestArguments{
		AdapterID:       "go",
		PathFormat:      "url", // unsupported 'pathFormat'
		LinesStartAt1:   true,
		ColumnsStartAt1: true,
		Locale:          "en-us",
	},
		"Failed to initialize: Unsupported 'pathFormat' value 'url'.",
	)

	// LinesStartAt1 must be true.
	runInitializeTest(dap.InitializeRequestArguments{
		AdapterID:       "go",
		PathFormat:      "path",
		LinesStartAt1:   false, // only 1-based line numbers are supported
		ColumnsStartAt1: true,
		Locale:          "en-us",
	},
		"Failed to initialize: Only 1-based line numbers are supported.",
	)

	// ColumnsStartAt1 must be true.
	runInitializeTest(dap.InitializeRequestArguments{
		AdapterID:       "go",
		PathFormat:      "path",
		LinesStartAt1:   true,
		ColumnsStartAt1: false, // only 1-based column numbers are supported
		Locale:          "en-us",
	},
		"Failed to initialize: Only 1-based column numbers are supported.",
	)
}

func TestBadlyFormattedMessageToServer(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// Send a badly formatted message to the server, and expect it to close the
		// connection.
		client.BadRequest()
		time.Sleep(100 * time.Millisecond)

		_, err := client.ReadMessage()

		if err != io.EOF {
			t.Errorf("got err=%v, want io.EOF", err)
		}
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// Send an unknown request message to the server, and expect it to send
		// an error response.
		client.UnknownRequest()
		err := client.ExpectErrorResponse(t)
		if err.Body.Error.Format != "Internal Error: Request command 'unknown' is not supported (seq: 1)" || err.RequestSeq != 1 {
			t.Errorf("got %v, want  RequestSeq=1 Error=\"Internal Error: Request command 'unknown' is not supported (seq: 1)\"", err)
		}

		// Make sure that the unknown request did not kill the server.
		client.InitializeRequest()
		client.ExpectInitializeResponse(t)

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
	})
}

func TestParseLogPoint(t *testing.T) {
	tests := []struct {
		name           string
		msg            string
		wantTracepoint bool
		wantFormat     string
		wantArgs       []string
		wantErr        bool
	}{
		// Test simple log messages.
		{name: "simple string", msg: "hello, world!", wantTracepoint: true, wantFormat: "hello, world!"},
		{name: "empty string", msg: "", wantTracepoint: false, wantErr: false},
		// Test parse eval expressions.
		{
			name:           "simple eval",
			msg:            "{x}",
			wantTracepoint: true,
			wantFormat:     "%s",
			wantArgs:       []string{"x"},
		},
		{
			name:           "type cast",
			msg:            "hello {string(x)}",
			wantTracepoint: true,
			wantFormat:     "hello %s",
			wantArgs:       []string{"string(x)"},
		},
		{
			name:           "multiple eval",
			msg:            "{x} {y} {z}",
			wantTracepoint: true,
			wantFormat:     "%s %s %s",
			wantArgs:       []string{"x", "y", "z"},
		},
		{
			name:           "eval expressions contain braces",
			msg:            "{interface{}(x)} {myType{y}} {[]myType{{z}}}",
			wantTracepoint: true,
			wantFormat:     "%s %s %s",
			wantArgs:       []string{"interface{}(x)", "myType{y}", "[]myType{{z}}"},
		},
		// Test parse errors.
		{name: "empty evaluation", msg: "{}", wantErr: true},
		{name: "empty space evaluation", msg: "{   \n}", wantErr: true},
		{name: "open brace missing closed", msg: "{", wantErr: true},
		{name: "closed brace missing open", msg: "}", wantErr: true},
		{name: "open brace in expression", msg: `{m["{"]}`, wantErr: true},
		{name: "closed brace in expression", msg: `{m["}"]}`, wantErr: true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotTracepoint, gotLogMessage, err := parseLogPoint(tt.msg)
			if gotTracepoint != tt.wantTracepoint {
				t.Errorf("parseLogPoint() tracepoint = %v, wantTracepoint %v", gotTracepoint, tt.wantTracepoint)
				return
			}
			if (err != nil) != tt.wantErr {
				t.Errorf("parseLogPoint() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !tt.wantTracepoint {
				return
			}
			if gotLogMessage == nil {
				t.Errorf("parseLogPoint() gotLogMessage = nil, want log message")
				return
			}
			if gotLogMessage.format != tt.wantFormat {
				t.Errorf("parseLogPoint() gotFormat = %v, want %v", gotLogMessage.format, tt.wantFormat)
			}
			if !reflect.DeepEqual(gotLogMessage.args, tt.wantArgs) {
				t.Errorf("parseLogPoint() gotArgs = %v, want %v", gotLogMessage.args, tt.wantArgs)
			}
		})
	}
}

func TestDisassemble(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{17},
			[]onBreakpoint{{
				// Stop at line 17
				execute: func() {
					checkStop(t, client, 1, "main.main", 17)

					client.StackTraceRequest(1, 0, 1)
					st := client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}
					// Request the single instruction that the program is stopped at.
					pc := st.Body.StackFrames[0].InstructionPointerReference
					client.DisassembleRequest(pc, 0, 1)
					dr := client.ExpectDisassembleResponse(t)
					if len(dr.Body.Instructions) != 1 {
						t.Errorf("\ngot %#v\nwant len(instructions) = 1", dr)
					} else if dr.Body.Instructions[0].Address != pc {
						t.Errorf("\ngot %#v\nwant instructions[0].Address = %s", dr, pc)
					}

					// Request the instruction that the program is stopped at, and the two
					// surrounding it.
					client.DisassembleRequest(pc, -1, 3)
					dr = client.ExpectDisassembleResponse(t)
					if len(dr.Body.Instructions) != 3 {
						t.Errorf("\ngot %#v\nwant len(instructions) = 3", dr)
					} else if dr.Body.Instructions[1].Address != pc {
						t.Errorf("\ngot %#v\nwant instructions[1].Address = %s", dr, pc)
					}

					// Request zero instrutions.
					client.DisassembleRequest(pc, 0, 0)
					dr = client.ExpectDisassembleResponse(t)
					if len(dr.Body.Instructions) != 0 {
						t.Errorf("\ngot %#v\nwant len(instructions) = 0", dr)
					}

					// Request invalid instructions.
					var checkInvalidInstruction = func(instructions []dap.DisassembledInstruction, count int, address uint64) {
						if len(instructions) != count {
							t.Errorf("\ngot %#v\nwant len(instructions) = %d", dr, count)
						}
						for i, got := range instructions {
							if got.Instruction != invalidInstruction.Instruction {
								t.Errorf("\ngot [%d].Instruction=%q\nwant = %#v", i, got.Instruction, invalidInstruction.Address)
							}
							addr, err := strconv.ParseUint(got.Address, 0, 64)
							if err != nil {
								t.Error(err)
								continue
							}
							if addr != address {
								t.Errorf("\ngot [%d].Address=%s\nwant = %#x", i, got.Address, address)
							}
						}
					}
					client.DisassembleRequest("0x0", 0, 10)
					checkInvalidInstruction(client.ExpectDisassembleResponse(t).Body.Instructions, 10, 0)

					client.DisassembleRequest(fmt.Sprintf("%#x", uint64(math.MaxUint64)), 0, 10)
					checkInvalidInstruction(client.ExpectDisassembleResponse(t).Body.Instructions, 10, uint64(math.MaxUint64))

					// Bad request, not a number.
					client.DisassembleRequest("hello, world!", 0, 1)
					client.ExpectErrorResponse(t)

					// Bad request, not an address in program.
					client.DisassembleRequest("0x5", 0, 100)
					client.ExpectErrorResponse(t)
				},
				disconnect: true,
			}},
		)
	})
}

func TestAlignPCs(t *testing.T) {
	NUM_FUNCS := 10
	// Create fake functions to test align PCs.
	funcs := make([]proc.Function, NUM_FUNCS)
	for i := 0; i < len(funcs); i++ {
		funcs[i] = proc.Function{
			Entry: uint64(100 + i*10),
			End:   uint64(100 + i*10 + 5),
		}
	}
	bi := &proc.BinaryInfo{
		Functions: funcs,
	}
	type args struct {
		start uint64
		end   uint64
	}
	tests := []struct {
		name      string
		args      args
		wantStart uint64
		wantEnd   uint64
	}{
		{
			name: "out of bounds",
			args: args{
				start: funcs[0].Entry - 5,
				end:   funcs[NUM_FUNCS-1].End + 5,
			},
			wantStart: funcs[0].Entry,         // start of first function
			wantEnd:   funcs[NUM_FUNCS-1].End, // end of last function
		},
		{
			name: "same function",
			args: args{
				start: funcs[1].Entry + 1,
				end:   funcs[1].Entry + 2,
			},
			wantStart: funcs[1].Entry, // start of containing function
			wantEnd:   funcs[1].End,   // end of containing function
		},
		{
			name: "between functions",
			args: args{
				start: funcs[1].End + 1,
				end:   funcs[1].End + 2,
			},
			wantStart: funcs[1].Entry, // start of function before
			wantEnd:   funcs[2].Entry, // start of function after
		},
		{
			name: "start of function",
			args: args{
				start: funcs[2].Entry,
				end:   funcs[5].Entry,
			},
			wantStart: funcs[2].Entry, // start of current function
			wantEnd:   funcs[5].End,   // end of current function
		},
		{
			name: "end of function",
			args: args{
				start: funcs[4].End,
				end:   funcs[8].End,
			},
			wantStart: funcs[4].Entry, // start of current function
			wantEnd:   funcs[9].Entry, // start of next function
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotStart, gotEnd := alignPCs(bi, tt.args.start, tt.args.end)
			if gotStart != tt.wantStart {
				t.Errorf("alignPCs() got start = %v, want %v", gotStart, tt.wantStart)
			}
			if gotEnd != tt.wantEnd {
				t.Errorf("alignPCs() got end = %v, want %v", gotEnd, tt.wantEnd)
			}
		})
	}
}

func TestFindInstructions(t *testing.T) {
	numInstructions := 100
	startPC := 0x1000
	procInstructions := make([]proc.AsmInstruction, numInstructions)
	for i := 0; i < len(procInstructions); i++ {
		procInstructions[i] = proc.AsmInstruction{
			Loc: proc.Location{
				PC: uint64(startPC + 2*i),
			},
		}
	}
	type args struct {
		addr   uint64
		offset int
		count  int
	}
	tests := []struct {
		name             string
		args             args
		wantInstructions []proc.AsmInstruction
		wantOffset       int
		wantErr          bool
	}{
		{
			name: "request all",
			args: args{
				addr:   uint64(startPC),
				offset: 0,
				count:  100,
			},
			wantInstructions: procInstructions,
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request all (with offset)",
			args: args{
				addr:   uint64(startPC + numInstructions), // the instruction addr at numInstructions/2
				offset: -numInstructions / 2,
				count:  numInstructions,
			},
			wantInstructions: procInstructions,
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request half (with offset)",
			args: args{
				addr:   uint64(startPC),
				offset: 0,
				count:  numInstructions / 2,
			},
			wantInstructions: procInstructions[:numInstructions/2],
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request half (with offset)",
			args: args{
				addr:   uint64(startPC),
				offset: numInstructions / 2,
				count:  numInstructions / 2,
			},
			wantInstructions: procInstructions[numInstructions/2:],
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request too many",
			args: args{
				addr:   uint64(startPC),
				offset: 0,
				count:  numInstructions * 2,
			},
			wantInstructions: procInstructions,
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request too many with offset",
			args: args{
				addr:   uint64(startPC),
				offset: -numInstructions,
				count:  numInstructions * 2,
			},
			wantInstructions: procInstructions,
			wantOffset:       numInstructions,
			wantErr:          false,
		},
		{
			name: "request out of bounds",
			args: args{
				addr:   uint64(startPC),
				offset: -numInstructions,
				count:  numInstructions,
			},
			wantInstructions: []proc.AsmInstruction{},
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request out of bounds",
			args: args{
				addr:   uint64(uint64(startPC + 2*(numInstructions-1))),
				offset: 1,
				count:  numInstructions,
			},
			wantInstructions: []proc.AsmInstruction{},
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "addr out of bounds (low)",
			args: args{
				addr:   0,
				offset: 0,
				count:  100,
			},
			wantInstructions: nil,
			wantOffset:       -1,
			wantErr:          true,
		},
		{
			name: "addr out of bounds (high)",
			args: args{
				addr:   uint64(startPC + 2*(numInstructions+1)),
				offset: -10,
				count:  20,
			},
			wantInstructions: nil,
			wantOffset:       -1,
			wantErr:          true,
		},
		{
			name: "addr not aligned",
			args: args{
				addr:   uint64(startPC + 1),
				offset: 0,
				count:  20,
			},
			wantInstructions: nil,
			wantOffset:       -1,
			wantErr:          true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotInstructions, gotOffset, err := findInstructions(procInstructions, tt.args.addr, tt.args.offset, tt.args.count)
			if (err != nil) != tt.wantErr {
				t.Errorf("findInstructions() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(gotInstructions, tt.wantInstructions) {
				t.Errorf("findInstructions() got instructions = %v, want %v", gotInstructions, tt.wantInstructions)
			}
			if gotOffset != tt.wantOffset {
				t.Errorf("findInstructions() got offset = %v, want %v", gotOffset, tt.wantOffset)
			}
		})
	}
}