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 "fmt" 12 "os" 13 "regexp" 14 "strings" 15 "testing" 16 "time" 17 ) 18 19 const ( 20 Rdate = `[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]` 21 Rtime = `[0-9][0-9]:[0-9][0-9]:[0-9][0-9]` 22 Rmicroseconds = `\.[0-9][0-9][0-9][0-9][0-9][0-9]` 23 Rline = `(57|59):` // must update if the calls to l.Printf / l.Print below move 24 Rlongfile = `.*/[A-Za-z0-9_\-]+\.go:` + Rline 25 Rshortfile = `[A-Za-z0-9_\-]+\.go:` + Rline 26 ) 27 28 type tester struct { 29 flag int 30 prefix string 31 pattern string // regexp that log output must match; we add ^ and expected_text$ always 32 } 33 34 var tests = []tester{ 35 // individual pieces: 36 {0, "", ""}, 37 {0, "XXX", "XXX"}, 38 {Ldate, "", Rdate + " "}, 39 {Ltime, "", Rtime + " "}, 40 {Ltime | Lmicroseconds, "", Rtime + Rmicroseconds + " "}, 41 {Lmicroseconds, "", Rtime + Rmicroseconds + " "}, // microsec implies time 42 {Llongfile, "", Rlongfile + " "}, 43 {Lshortfile, "", Rshortfile + " "}, 44 {Llongfile | Lshortfile, "", Rshortfile + " "}, // shortfile overrides longfile 45 // everything at once: 46 {Ldate | Ltime | Lmicroseconds | Llongfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rlongfile + " "}, 47 {Ldate | Ltime | Lmicroseconds | Lshortfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rshortfile + " "}, 48 } 49 50 // Test using Println("hello", 23, "world") or using Printf("hello %d world", 23) 51 func testPrint(t *testing.T, flag int, prefix string, pattern string, useFormat bool) { 52 buf := new(bytes.Buffer) 53 SetOutput(buf) 54 SetFlags(flag) 55 SetPrefix(prefix) 56 if useFormat { 57 Printf("hello %d world", 23) 58 } else { 59 Println("hello", 23, "world") 60 } 61 line := buf.String() 62 line = line[0 : len(line)-1] 63 pattern = "^" + pattern + "hello 23 world$" 64 matched, err4 := regexp.MatchString(pattern, line) 65 if err4 != nil { 66 t.Fatal("pattern did not compile:", err4) 67 } 68 if !matched { 69 t.Errorf("log output should match %q is %q", pattern, line) 70 } 71 SetOutput(os.Stderr) 72 } 73 74 func TestAll(t *testing.T) { 75 for _, testcase := range tests { 76 testPrint(t, testcase.flag, testcase.prefix, testcase.pattern, false) 77 testPrint(t, testcase.flag, testcase.prefix, testcase.pattern, true) 78 } 79 } 80 81 func TestOutput(t *testing.T) { 82 const testString = "test" 83 var b bytes.Buffer 84 l := New(&b, "", 0) 85 l.Println(testString) 86 if expect := testString + "\n"; b.String() != expect { 87 t.Errorf("log output should match %q is %q", expect, b.String()) 88 } 89 } 90 91 func TestFlagAndPrefixSetting(t *testing.T) { 92 var b bytes.Buffer 93 l := New(&b, "Test:", LstdFlags) 94 f := l.Flags() 95 if f != LstdFlags { 96 t.Errorf("Flags 1: expected %x got %x", LstdFlags, f) 97 } 98 l.SetFlags(f | Lmicroseconds) 99 f = l.Flags() 100 if f != LstdFlags|Lmicroseconds { 101 t.Errorf("Flags 2: expected %x got %x", LstdFlags|Lmicroseconds, f) 102 } 103 p := l.Prefix() 104 if p != "Test:" { 105 t.Errorf(`Prefix: expected "Test:" got %q`, p) 106 } 107 l.SetPrefix("Reality:") 108 p = l.Prefix() 109 if p != "Reality:" { 110 t.Errorf(`Prefix: expected "Reality:" got %q`, p) 111 } 112 // Verify a log message looks right, with our prefix and microseconds present. 113 l.Print("hello") 114 pattern := "^Reality:" + Rdate + " " + Rtime + Rmicroseconds + " hello\n" 115 matched, err := regexp.Match(pattern, b.Bytes()) 116 if err != nil { 117 t.Fatalf("pattern %q did not compile: %s", pattern, err) 118 } 119 if !matched { 120 t.Error("message did not match pattern") 121 } 122 } 123 124 func TestUTCFlag(t *testing.T) { 125 var b bytes.Buffer 126 l := New(&b, "Test:", LstdFlags) 127 l.SetFlags(Ldate | Ltime | LUTC) 128 // Verify a log message looks right in the right time zone. Quantize to the second only. 129 now := time.Now().UTC() 130 l.Print("hello") 131 want := fmt.Sprintf("Test:%d/%.2d/%.2d %.2d:%.2d:%.2d hello\n", 132 now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second()) 133 got := b.String() 134 if got == want { 135 return 136 } 137 // It's possible we crossed a second boundary between getting now and logging, 138 // so add a second and try again. This should very nearly always work. 139 now = now.Add(time.Second) 140 want = fmt.Sprintf("Test:%d/%.2d/%.2d %.2d:%.2d:%.2d hello\n", 141 now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second()) 142 if got == want { 143 return 144 } 145 t.Errorf("got %q; want %q", got, want) 146 } 147 148 func TestEmptyPrintCreatesLine(t *testing.T) { 149 var b bytes.Buffer 150 l := New(&b, "Header:", LstdFlags) 151 l.Print() 152 l.Println("non-empty") 153 output := b.String() 154 if n := strings.Count(output, "Header"); n != 2 { 155 t.Errorf("expected 2 headers, got %d", n) 156 } 157 if n := strings.Count(output, "\n"); n != 2 { 158 t.Errorf("expected 2 lines, got %d", n) 159 } 160 } 161 162 func BenchmarkItoa(b *testing.B) { 163 dst := make([]byte, 0, 64) 164 for i := 0; i < b.N; i++ { 165 dst = dst[0:0] 166 itoa(&dst, 2015, 4) // year 167 itoa(&dst, 1, 2) // month 168 itoa(&dst, 30, 2) // day 169 itoa(&dst, 12, 2) // hour 170 itoa(&dst, 56, 2) // minute 171 itoa(&dst, 0, 2) // second 172 itoa(&dst, 987654, 6) // microsecond 173 } 174 } 175 176 func BenchmarkPrintln(b *testing.B) { 177 const testString = "test" 178 var buf bytes.Buffer 179 l := New(&buf, "", LstdFlags) 180 for i := 0; i < b.N; i++ { 181 buf.Reset() 182 l.Println(testString) 183 } 184 } 185
