github.com/hongwozai/go-src-1.4.3@v0.0.0-20191127132709-dc3fce3dbccb/src/log/log_test.go (about)

     1  // Copyright 2009 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  package log
     6  
     7  // These tests are too simple.
     8  
     9  import (
    10  	"bytes"
    11  	"os"
    12  	"regexp"
    13  	"testing"
    14  )
    15  
    16  const (
    17  	Rdate         = `[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]`
    18  	Rtime         = `[0-9][0-9]:[0-9][0-9]:[0-9][0-9]`
    19  	Rmicroseconds = `\.[0-9][0-9][0-9][0-9][0-9][0-9]`
    20  	Rline         = `(54|56):` // must update if the calls to l.Printf / l.Print below move
    21  	Rlongfile     = `.*/[A-Za-z0-9_\-]+\.go:` + Rline
    22  	Rshortfile    = `[A-Za-z0-9_\-]+\.go:` + Rline
    23  )
    24  
    25  type tester struct {
    26  	flag    int
    27  	prefix  string
    28  	pattern string // regexp that log output must match; we add ^ and expected_text$ always
    29  }
    30  
    31  var tests = []tester{
    32  	// individual pieces:
    33  	{0, "", ""},
    34  	{0, "XXX", "XXX"},
    35  	{Ldate, "", Rdate + " "},
    36  	{Ltime, "", Rtime + " "},
    37  	{Ltime | Lmicroseconds, "", Rtime + Rmicroseconds + " "},
    38  	{Lmicroseconds, "", Rtime + Rmicroseconds + " "}, // microsec implies time
    39  	{Llongfile, "", Rlongfile + " "},
    40  	{Lshortfile, "", Rshortfile + " "},
    41  	{Llongfile | Lshortfile, "", Rshortfile + " "}, // shortfile overrides longfile
    42  	// everything at once:
    43  	{Ldate | Ltime | Lmicroseconds | Llongfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rlongfile + " "},
    44  	{Ldate | Ltime | Lmicroseconds | Lshortfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rshortfile + " "},
    45  }
    46  
    47  // Test using Println("hello", 23, "world") or using Printf("hello %d world", 23)
    48  func testPrint(t *testing.T, flag int, prefix string, pattern string, useFormat bool) {
    49  	buf := new(bytes.Buffer)
    50  	SetOutput(buf)
    51  	SetFlags(flag)
    52  	SetPrefix(prefix)
    53  	if useFormat {
    54  		Printf("hello %d world", 23)
    55  	} else {
    56  		Println("hello", 23, "world")
    57  	}
    58  	line := buf.String()
    59  	line = line[0 : len(line)-1]
    60  	pattern = "^" + pattern + "hello 23 world$"
    61  	matched, err4 := regexp.MatchString(pattern, line)
    62  	if err4 != nil {
    63  		t.Fatal("pattern did not compile:", err4)
    64  	}
    65  	if !matched {
    66  		t.Errorf("log output should match %q is %q", pattern, line)
    67  	}
    68  	SetOutput(os.Stderr)
    69  }
    70  
    71  func TestAll(t *testing.T) {
    72  	for _, testcase := range tests {
    73  		testPrint(t, testcase.flag, testcase.prefix, testcase.pattern, false)
    74  		testPrint(t, testcase.flag, testcase.prefix, testcase.pattern, true)
    75  	}
    76  }
    77  
    78  func TestOutput(t *testing.T) {
    79  	const testString = "test"
    80  	var b bytes.Buffer
    81  	l := New(&b, "", 0)
    82  	l.Println(testString)
    83  	if expect := testString + "\n"; b.String() != expect {
    84  		t.Errorf("log output should match %q is %q", expect, b.String())
    85  	}
    86  }
    87  
    88  func TestFlagAndPrefixSetting(t *testing.T) {
    89  	var b bytes.Buffer
    90  	l := New(&b, "Test:", LstdFlags)
    91  	f := l.Flags()
    92  	if f != LstdFlags {
    93  		t.Errorf("Flags 1: expected %x got %x", LstdFlags, f)
    94  	}
    95  	l.SetFlags(f | Lmicroseconds)
    96  	f = l.Flags()
    97  	if f != LstdFlags|Lmicroseconds {
    98  		t.Errorf("Flags 2: expected %x got %x", LstdFlags|Lmicroseconds, f)
    99  	}
   100  	p := l.Prefix()
   101  	if p != "Test:" {
   102  		t.Errorf(`Prefix: expected "Test:" got %q`, p)
   103  	}
   104  	l.SetPrefix("Reality:")
   105  	p = l.Prefix()
   106  	if p != "Reality:" {
   107  		t.Errorf(`Prefix: expected "Reality:" got %q`, p)
   108  	}
   109  	// Verify a log message looks right, with our prefix and microseconds present.
   110  	l.Print("hello")
   111  	pattern := "^Reality:" + Rdate + " " + Rtime + Rmicroseconds + " hello\n"
   112  	matched, err := regexp.Match(pattern, b.Bytes())
   113  	if err != nil {
   114  		t.Fatalf("pattern %q did not compile: %s", pattern, err)
   115  	}
   116  	if !matched {
   117  		t.Error("message did not match pattern")
   118  	}
   119  }