github.com/april1989/origin-go-tools@v0.0.32/cmd/cover/cover_test.go (about)

     1  // Copyright 2013 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // No testdata on Android.
     6  
     7  // +build !android
     8  
     9  package main_test
    10  
    11  import (
    12  	"bytes"
    13  	"fmt"
    14  	"io/ioutil"
    15  	"os"
    16  	"os/exec"
    17  	"path/filepath"
    18  	"testing"
    19  
    20  	"github.com/april1989/origin-go-tools/internal/testenv"
    21  )
    22  
    23  const (
    24  	// Data directory, also the package directory for the test.
    25  	testdata = "testdata"
    26  )
    27  
    28  var debug = false // Keeps the rewritten files around if set.
    29  
    30  // Run this shell script, but do it in Go so it can be run by "go test".
    31  //
    32  //	replace the word LINE with the line number < testdata/test.go > testdata/test_line.go
    33  // 	go build -o ./testcover
    34  // 	./testcover -mode=count -var=CoverTest -o ./testdata/test_cover.go testdata/test_line.go
    35  //	go run ./testdata/main.go ./testdata/test.go
    36  //
    37  func TestCover(t *testing.T) {
    38  	testenv.NeedsTool(t, "go")
    39  
    40  	tmpdir, err := ioutil.TempDir("", "TestCover")
    41  	if err != nil {
    42  		t.Fatal(err)
    43  	}
    44  	defer func() {
    45  		if debug {
    46  			fmt.Printf("test files left in %s\n", tmpdir)
    47  		} else {
    48  			os.RemoveAll(tmpdir)
    49  		}
    50  	}()
    51  
    52  	testcover := filepath.Join(tmpdir, "testcover.exe")
    53  	testMain := filepath.Join(tmpdir, "main.go")
    54  	testTest := filepath.Join(tmpdir, "test.go")
    55  	coverInput := filepath.Join(tmpdir, "test_line.go")
    56  	coverOutput := filepath.Join(tmpdir, "test_cover.go")
    57  
    58  	for _, f := range []string{testMain, testTest} {
    59  		data, err := ioutil.ReadFile(filepath.Join(testdata, filepath.Base(f)))
    60  		if err != nil {
    61  			t.Fatal(err)
    62  		}
    63  		if err := ioutil.WriteFile(f, data, 0644); err != nil {
    64  			t.Fatal(err)
    65  		}
    66  	}
    67  
    68  	// Read in the test file (testTest) and write it, with LINEs specified, to coverInput.
    69  	file, err := ioutil.ReadFile(testTest)
    70  	if err != nil {
    71  		t.Fatal(err)
    72  	}
    73  	lines := bytes.Split(file, []byte("\n"))
    74  	for i, line := range lines {
    75  		lines[i] = bytes.Replace(line, []byte("LINE"), []byte(fmt.Sprint(i+1)), -1)
    76  	}
    77  	err = ioutil.WriteFile(coverInput, bytes.Join(lines, []byte("\n")), 0666)
    78  	if err != nil {
    79  		t.Fatal(err)
    80  	}
    81  
    82  	// go build -o testcover
    83  	cmd := exec.Command("go", "build", "-o", testcover)
    84  	run(cmd, t)
    85  
    86  	// ./testcover -mode=count -var=coverTest -o ./testdata/test_cover.go testdata/test_line.go
    87  	cmd = exec.Command(testcover, "-mode=count", "-var=coverTest", "-o", coverOutput, coverInput)
    88  	run(cmd, t)
    89  
    90  	// defer removal of ./testdata/test_cover.go
    91  	if !debug {
    92  		defer os.Remove(coverOutput)
    93  	}
    94  
    95  	// go run ./testdata/main.go ./testdata/test.go
    96  	cmd = exec.Command("go", "run", testMain, coverOutput)
    97  	run(cmd, t)
    98  }
    99  
   100  func run(c *exec.Cmd, t *testing.T) {
   101  	c.Stdout = os.Stdout
   102  	c.Stderr = os.Stderr
   103  	err := c.Run()
   104  	if err != nil {
   105  		t.Fatal(err)
   106  	}
   107  }