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