1 files changed, 214 insertions, 0 deletions
diff --git a/src/log/log_test.go b/src/log/log_test.go
new file mode 100644
index 0000000..5be8e82
--- /dev/null
+++ b/src/log/log_test.go
@@ -0,0 +1,214 @@
+// 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"
+	"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         = `(60|62):` // 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 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)
+	}
+}