226 lines
6.2 KiB
Go
226 lines
6.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package log
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// These tests are too simple.
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"regexp"
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"strings"
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"testing"
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"time"
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)
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const (
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Rdate = `[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]`
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Rtime = `[0-9][0-9]:[0-9][0-9]:[0-9][0-9]`
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Rmicroseconds = `\.[0-9][0-9][0-9][0-9][0-9][0-9]`
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Rline = `(61|63):` // must update if the calls to l.Printf / l.Print below move
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Rlongfile = `.*/[A-Za-z0-9_\-]+\.go:` + Rline
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Rshortfile = `[A-Za-z0-9_\-]+\.go:` + Rline
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)
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type tester struct {
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flag int
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prefix string
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pattern string // regexp that log output must match; we add ^ and expected_text$ always
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}
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var tests = []tester{
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// individual pieces:
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{0, "", ""},
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{0, "XXX", "XXX"},
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{Ldate, "", Rdate + " "},
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{Ltime, "", Rtime + " "},
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{Ltime | Lmsgprefix, "XXX", Rtime + " XXX"},
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{Ltime | Lmicroseconds, "", Rtime + Rmicroseconds + " "},
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{Lmicroseconds, "", Rtime + Rmicroseconds + " "}, // microsec implies time
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{Llongfile, "", Rlongfile + " "},
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{Lshortfile, "", Rshortfile + " "},
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{Llongfile | Lshortfile, "", Rshortfile + " "}, // shortfile overrides longfile
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// everything at once:
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{Ldate | Ltime | Lmicroseconds | Llongfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rlongfile + " "},
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{Ldate | Ltime | Lmicroseconds | Lshortfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rshortfile + " "},
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{Ldate | Ltime | Lmicroseconds | Llongfile | Lmsgprefix, "XXX", Rdate + " " + Rtime + Rmicroseconds + " " + Rlongfile + " XXX"},
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{Ldate | Ltime | Lmicroseconds | Lshortfile | Lmsgprefix, "XXX", Rdate + " " + Rtime + Rmicroseconds + " " + Rshortfile + " XXX"},
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}
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// Test using Println("hello", 23, "world") or using Printf("hello %d world", 23)
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func testPrint(t *testing.T, flag int, prefix string, pattern string, useFormat bool) {
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buf := new(bytes.Buffer)
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SetOutput(buf)
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SetFlags(flag)
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SetPrefix(prefix)
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if useFormat {
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Printf("hello %d world", 23)
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} else {
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Println("hello", 23, "world")
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}
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line := buf.String()
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line = line[0 : len(line)-1]
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pattern = "^" + pattern + "hello 23 world$"
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matched, err := regexp.MatchString(pattern, line)
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if err != nil {
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t.Fatal("pattern did not compile:", err)
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}
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if !matched {
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t.Errorf("log output should match %q is %q", pattern, line)
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}
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SetOutput(os.Stderr)
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}
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func TestDefault(t *testing.T) {
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if got := Default(); got != std {
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t.Errorf("Default [%p] should be std [%p]", got, std)
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}
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}
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func TestAll(t *testing.T) {
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for _, testcase := range tests {
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testPrint(t, testcase.flag, testcase.prefix, testcase.pattern, false)
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testPrint(t, testcase.flag, testcase.prefix, testcase.pattern, true)
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}
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}
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func TestOutput(t *testing.T) {
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const testString = "test"
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var b bytes.Buffer
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l := New(&b, "", 0)
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l.Println(testString)
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if expect := testString + "\n"; b.String() != expect {
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t.Errorf("log output should match %q is %q", expect, b.String())
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}
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}
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func TestOutputRace(t *testing.T) {
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var b bytes.Buffer
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l := New(&b, "", 0)
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for i := 0; i < 100; i++ {
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go func() {
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l.SetFlags(0)
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}()
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l.Output(0, "")
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}
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}
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func TestFlagAndPrefixSetting(t *testing.T) {
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var b bytes.Buffer
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l := New(&b, "Test:", LstdFlags)
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f := l.Flags()
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if f != LstdFlags {
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t.Errorf("Flags 1: expected %x got %x", LstdFlags, f)
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}
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l.SetFlags(f | Lmicroseconds)
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f = l.Flags()
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if f != LstdFlags|Lmicroseconds {
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t.Errorf("Flags 2: expected %x got %x", LstdFlags|Lmicroseconds, f)
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}
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p := l.Prefix()
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if p != "Test:" {
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t.Errorf(`Prefix: expected "Test:" got %q`, p)
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}
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l.SetPrefix("Reality:")
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p = l.Prefix()
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if p != "Reality:" {
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t.Errorf(`Prefix: expected "Reality:" got %q`, p)
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}
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// Verify a log message looks right, with our prefix and microseconds present.
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l.Print("hello")
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pattern := "^Reality:" + Rdate + " " + Rtime + Rmicroseconds + " hello\n"
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matched, err := regexp.Match(pattern, b.Bytes())
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if err != nil {
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t.Fatalf("pattern %q did not compile: %s", pattern, err)
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}
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if !matched {
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t.Error("message did not match pattern")
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}
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}
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func TestUTCFlag(t *testing.T) {
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var b bytes.Buffer
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l := New(&b, "Test:", LstdFlags)
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l.SetFlags(Ldate | Ltime | LUTC)
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// Verify a log message looks right in the right time zone. Quantize to the second only.
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now := time.Now().UTC()
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l.Print("hello")
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want := fmt.Sprintf("Test:%d/%.2d/%.2d %.2d:%.2d:%.2d hello\n",
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now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second())
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got := b.String()
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if got == want {
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return
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}
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// It's possible we crossed a second boundary between getting now and logging,
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// so add a second and try again. This should very nearly always work.
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now = now.Add(time.Second)
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want = fmt.Sprintf("Test:%d/%.2d/%.2d %.2d:%.2d:%.2d hello\n",
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now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second())
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if got == want {
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return
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}
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t.Errorf("got %q; want %q", got, want)
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}
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func TestEmptyPrintCreatesLine(t *testing.T) {
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var b bytes.Buffer
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l := New(&b, "Header:", LstdFlags)
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l.Print()
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l.Println("non-empty")
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output := b.String()
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if n := strings.Count(output, "Header"); n != 2 {
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t.Errorf("expected 2 headers, got %d", n)
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}
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if n := strings.Count(output, "\n"); n != 2 {
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t.Errorf("expected 2 lines, got %d", n)
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}
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}
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func TestDiscard(t *testing.T) {
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l := New(io.Discard, "", 0)
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s := strings.Repeat("a", 102400)
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c := testing.AllocsPerRun(100, func() { l.Printf("%s", s) })
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// One allocation for slice passed to Printf,
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// but none for formatting of long string.
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if c > 1 {
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t.Errorf("got %v allocs, want at most 1", c)
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}
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}
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func BenchmarkItoa(b *testing.B) {
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dst := make([]byte, 0, 64)
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for i := 0; i < b.N; i++ {
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dst = dst[0:0]
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itoa(&dst, 2015, 4) // year
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itoa(&dst, 1, 2) // month
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itoa(&dst, 30, 2) // day
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itoa(&dst, 12, 2) // hour
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itoa(&dst, 56, 2) // minute
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itoa(&dst, 0, 2) // second
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itoa(&dst, 987654, 6) // microsecond
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}
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}
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func BenchmarkPrintln(b *testing.B) {
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const testString = "test"
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var buf bytes.Buffer
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l := New(&buf, "", LstdFlags)
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for i := 0; i < b.N; i++ {
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buf.Reset()
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l.Println(testString)
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}
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}
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func BenchmarkPrintlnNoFlags(b *testing.B) {
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const testString = "test"
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var buf bytes.Buffer
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l := New(&buf, "", 0)
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for i := 0; i < b.N; i++ {
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buf.Reset()
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l.Println(testString)
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}
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}
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