src/pkg/bufio/bufio_test.go - go - Git at Google

 // 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 bufio

 import (
 	"bytes"
 	"fmt"
 	"io"
 	"os"
 	"strings"
 	"testing"
 	"testing/iotest"
 	"utf8"
 )

 // Reads from a reader and rot13s the result.
 type rot13Reader struct {
 	r io.Reader
 }

 func newRot13Reader(r io.Reader) *rot13Reader {
 	r13 := new(rot13Reader)
 	r13.r = r
 	return r13
 }

 func (r13 *rot13Reader) Read(p []byte) (int, os.Error) {
 	n, e := r13.r.Read(p)
 	if e != nil {
 		return n, e
 	}
 	for i := 0; i < n; i++ {
 		c := p[i] | 0x20 // lowercase byte
 		if 'a' <= c && c <= 'm' {
 			p[i] += 13
 		} else if 'n' <= c && c <= 'z' {
 			p[i] -= 13
 		}
 	}
 	return n, nil
 }

 // Call ReadByte to accumulate the text of a file
 func readBytes(buf *Reader) string {
 	var b [1000]byte
 	nb := 0
 	for {
 		c, e := buf.ReadByte()
 		if e == os.EOF {
 			break
 		}
 		if e != nil {
 			panic("Data: " + e.String())
 		}
 		b[nb] = c
 		nb++
 	}
 	return string(b[0:nb])
 }

 func TestReaderSimple(t *testing.T) {
 	data := "hello world"
 	b := NewReader(bytes.NewBufferString(data))
 	if s := readBytes(b); s != "hello world" {
 		t.Errorf("simple hello world test failed: got %q", s)
 	}

 	b = NewReader(newRot13Reader(bytes.NewBufferString(data)))
 	if s := readBytes(b); s != "uryyb jbeyq" {
 		t.Error("rot13 hello world test failed: got %q", s)
 	}
 }


 type readMaker struct {
 	name string
 	fn   func(io.Reader) io.Reader
 }

 var readMakers = []readMaker{
 	readMaker{"full", func(r io.Reader) io.Reader { return r }},
 	readMaker{"byte", iotest.OneByteReader},
 	readMaker{"half", iotest.HalfReader},
 	readMaker{"data+err", iotest.DataErrReader},
 }

 // Call ReadString (which ends up calling everything else)
 // to accumulate the text of a file.
 func readLines(b *Reader) string {
 	s := ""
 	for {
 		s1, e := b.ReadString('\n')
 		if e == os.EOF {
 			break
 		}
 		if e != nil {
 			panic("GetLines: " + e.String())
 		}
 		s += s1
 	}
 	return s
 }

 // Call Read to accumulate the text of a file
 func reads(buf *Reader, m int) string {
 	var b [1000]byte
 	nb := 0
 	for {
 		n, e := buf.Read(b[nb : nb+m])
 		nb += n
 		if e == os.EOF {
 			break
 		}
 	}
 	return string(b[0:nb])
 }

 type bufReader struct {
 	name string
 	fn   func(*Reader) string
 }

 var bufreaders = []bufReader{
 	bufReader{"1", func(b *Reader) string { return reads(b, 1) }},
 	bufReader{"2", func(b *Reader) string { return reads(b, 2) }},
 	bufReader{"3", func(b *Reader) string { return reads(b, 3) }},
 	bufReader{"4", func(b *Reader) string { return reads(b, 4) }},
 	bufReader{"5", func(b *Reader) string { return reads(b, 5) }},
 	bufReader{"7", func(b *Reader) string { return reads(b, 7) }},
 	bufReader{"bytes", readBytes},
 	bufReader{"lines", readLines},
 }

 var bufsizes = []int{
 	1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
 	23, 32, 46, 64, 93, 128, 1024, 4096,
 }

 func TestReader(t *testing.T) {
 	var texts [31]string
 	str := ""
 	all := ""
 	for i := 0; i < len(texts)-1; i++ {
 		texts[i] = str + "\n"
 		all += texts[i]
 		str += string(i%26 + 'a')
 	}
 	texts[len(texts)-1] = all

 	for h := 0; h < len(texts); h++ {
 		text := texts[h]
 		for i := 0; i < len(readMakers); i++ {
 			for j := 0; j < len(bufreaders); j++ {
 				for k := 0; k < len(bufsizes); k++ {
 					readmaker := readMakers[i]
 					bufreader := bufreaders[j]
 					bufsize := bufsizes[k]
 					read := readmaker.fn(bytes.NewBufferString(text))
 					buf, _ := NewReaderSize(read, bufsize)
 					s := bufreader.fn(buf)
 					if s != text {
 						t.Errorf("reader=%s fn=%s bufsize=%d want=%q got=%q",
 							readmaker.name, bufreader.name, bufsize, text, s)
 					}
 				}
 			}
 		}
 	}
 }

 // A StringReader delivers its data one string segment at a time via Read.
 type StringReader struct {
 	data []string
 	step int
 }

 func (r *StringReader) Read(p []byte) (n int, err os.Error) {
 	if r.step < len(r.data) {
 		s := r.data[r.step]
 		for i := 0; i < len(s); i++ {
 			p[i] = s[i]
 		}
 		n = len(s)
 		r.step++
 	} else {
 		err = os.EOF
 	}
 	return
 }

 func readRuneSegments(t *testing.T, segments []string) {
 	got := ""
 	want := strings.Join(segments, "")
 	r := NewReader(&StringReader{data: segments})
 	for {
 		rune, _, err := r.ReadRune()
 		if err != nil {
 			if err != os.EOF {
 				return
 			}
 			break
 		}
 		got += string(rune)
 	}
 	if got != want {
 		t.Errorf("segments=%v got=%s want=%s", segments, got, want)
 	}
 }

 var segmentList = [][]string{
 	[]string{},
 	[]string{""},
 	[]string{"日", "本語"},
 	[]string{"\u65e5", "\u672c", "\u8a9e"},
 	[]string{"\U000065e5", "\U0000672c", "\U00008a9e"},
 	[]string{"\xe6", "\x97\xa5\xe6", "\x9c\xac\xe8\xaa\x9e"},
 	[]string{"Hello", ", ", "World", "!"},
 	[]string{"Hello", ", ", "", "World", "!"},
 }

 func TestReadRune(t *testing.T) {
 	for _, s := range segmentList {
 		readRuneSegments(t, s)
 	}
 }

 func TestReadWriteRune(t *testing.T) {
 	const NRune = 1000
 	byteBuf := new(bytes.Buffer)
 	w := NewWriter(byteBuf)
 	// Write the runes out using WriteRune
 	buf := make([]byte, utf8.UTFMax)
 	for rune := 0; rune < NRune; rune++ {
 		size := utf8.EncodeRune(rune, buf)
 		nbytes, err := w.WriteRune(rune)
 		if err != nil {
 			t.Fatalf("WriteRune(0x%x) error: %s", rune, err)
 		}
 		if nbytes != size {
 			t.Fatalf("WriteRune(0x%x) expected %d, got %d", rune, size, nbytes)
 		}
 	}
 	w.Flush()

 	r := NewReader(byteBuf)
 	// Read them back with ReadRune
 	for rune := 0; rune < NRune; rune++ {
 		size := utf8.EncodeRune(rune, buf)
 		nr, nbytes, err := r.ReadRune()
 		if nr != rune || nbytes != size || err != nil {
 			t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r, nr, nbytes, r, size, err)
 		}
 	}
 }

 func TestWriter(t *testing.T) {
 	var data [8192]byte

 	for i := 0; i < len(data); i++ {
 		data[i] = byte(' ' + i%('~'-' '))
 	}
 	w := new(bytes.Buffer)
 	for i := 0; i < len(bufsizes); i++ {
 		for j := 0; j < len(bufsizes); j++ {
 			nwrite := bufsizes[i]
 			bs := bufsizes[j]

 			// Write nwrite bytes using buffer size bs.
 			// Check that the right amount makes it out
 			// and that the data is correct.

 			w.Reset()
 			buf, e := NewWriterSize(w, bs)
 			context := fmt.Sprintf("nwrite=%d bufsize=%d", nwrite, bs)
 			if e != nil {
 				t.Errorf("%s: NewWriterSize %d: %v", context, bs, e)
 				continue
 			}
 			n, e1 := buf.Write(data[0:nwrite])
 			if e1 != nil || n != nwrite {
 				t.Errorf("%s: buf.Write %d = %d, %v", context, nwrite, n, e1)
 				continue
 			}
 			if e = buf.Flush(); e != nil {
 				t.Errorf("%s: buf.Flush = %v", context, e)
 			}

 			written := w.Bytes()
 			if len(written) != nwrite {
 				t.Errorf("%s: %d bytes written", context, len(written))
 			}
 			for l := 0; l < len(written); l++ {
 				if written[i] != data[i] {
 					t.Errorf("%s: wrong bytes written")
 					t.Errorf("want=%s", data[0:len(written)])
 					t.Errorf("have=%s", written)
 				}
 			}
 		}
 	}
 }

 // Check that write errors are returned properly.

 type errorWriterTest struct {
 	n, m   int
 	err    os.Error
 	expect os.Error
 }

 func (w errorWriterTest) Write(p []byte) (int, os.Error) {
 	return len(p) * w.n / w.m, w.err
 }

 var errorWriterTests = []errorWriterTest{
 	errorWriterTest{0, 1, nil, io.ErrShortWrite},
 	errorWriterTest{1, 2, nil, io.ErrShortWrite},
 	errorWriterTest{1, 1, nil, nil},
 	errorWriterTest{0, 1, os.EPIPE, os.EPIPE},
 	errorWriterTest{1, 2, os.EPIPE, os.EPIPE},
 	errorWriterTest{1, 1, os.EPIPE, os.EPIPE},
 }

 func TestWriteErrors(t *testing.T) {
 	for _, w := range errorWriterTests {
 		buf := NewWriter(w)
 		_, e := buf.Write([]byte("hello world"))
 		if e != nil {
 			t.Errorf("Write hello to %v: %v", w, e)
 			continue
 		}
 		e = buf.Flush()
 		if e != w.expect {
 			t.Errorf("Flush %v: got %v, wanted %v", w, e, w.expect)
 		}
 	}
 }

 func TestNewReaderSizeIdempotent(t *testing.T) {
 	const BufSize = 1000
 	b, err := NewReaderSize(bytes.NewBufferString("hello world"), BufSize)
 	if err != nil {
 		t.Error("NewReaderSize create fail", err)
 	}
 	// Does it recognize itself?
 	b1, err2 := NewReaderSize(b, BufSize)
 	if err2 != nil {
 		t.Error("NewReaderSize #2 create fail", err2)
 	}
 	if b1 != b {
 		t.Error("NewReaderSize did not detect underlying Reader")
 	}
 	// Does it wrap if existing buffer is too small?
 	b2, err3 := NewReaderSize(b, 2*BufSize)
 	if err3 != nil {
 		t.Error("NewReaderSize #3 create fail", err3)
 	}
 	if b2 == b {
 		t.Error("NewReaderSize did not enlarge buffer")
 	}
 }

 func TestNewWriterSizeIdempotent(t *testing.T) {
 	const BufSize = 1000
 	b, err := NewWriterSize(new(bytes.Buffer), BufSize)
 	if err != nil {
 		t.Error("NewWriterSize create fail", err)
 	}
 	// Does it recognize itself?
 	b1, err2 := NewWriterSize(b, BufSize)
 	if err2 != nil {
 		t.Error("NewWriterSize #2 create fail", err2)
 	}
 	if b1 != b {
 		t.Error("NewWriterSize did not detect underlying Writer")
 	}
 	// Does it wrap if existing buffer is too small?
 	b2, err3 := NewWriterSize(b, 2*BufSize)
 	if err3 != nil {
 		t.Error("NewWriterSize #3 create fail", err3)
 	}
 	if b2 == b {
 		t.Error("NewWriterSize did not enlarge buffer")
 	}
 }

 func TestWriteString(t *testing.T) {
 	const BufSize = 8
 	buf := new(bytes.Buffer)
 	b, err := NewWriterSize(buf, BufSize)
 	if err != nil {
 		t.Error("NewWriterSize create fail", err)
 	}
 	b.WriteString("0")                         // easy
 	b.WriteString("123456")                    // still easy
 	b.WriteString("7890")                      // easy after flush
 	b.WriteString("abcdefghijklmnopqrstuvwxy") // hard
 	b.WriteString("z")
 	b.Flush()
 	if b.err != nil {
 		t.Error("WriteString", b.err)
 	}
 	s := "01234567890abcdefghijklmnopqrstuvwxyz"
 	if string(buf.Bytes()) != s {
 		t.Errorf("WriteString wants %q gets %q", s, string(buf.Bytes()))
 	}
 }
	// 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 bufio

	import (
	"bytes"
	"fmt"
	"io"
	"os"
	"strings"
	"testing"
	"testing/iotest"
	"utf8"
	)

	// Reads from a reader and rot13s the result.
	type rot13Reader struct {
	r io.Reader
	}

	func newRot13Reader(r io.Reader) *rot13Reader {
	r13 := new(rot13Reader)
	r13.r = r
	return r13
	}

	func (r13 *rot13Reader) Read(p []byte) (int, os.Error) {
	n, e := r13.r.Read(p)
	if e != nil {
	return n, e
	}
	for i := 0; i < n; i++ {
	c := p[i] \| 0x20 // lowercase byte
	if 'a' <= c && c <= 'm' {
	p[i] += 13
	} else if 'n' <= c && c <= 'z' {
	p[i] -= 13
	}
	}
	return n, nil
	}

	// Call ReadByte to accumulate the text of a file
	func readBytes(buf *Reader) string {
	var b [1000]byte
	nb := 0
	for {
	c, e := buf.ReadByte()
	if e == os.EOF {
	break
	}
	if e != nil {
	panic("Data: " + e.String())
	}
	b[nb] = c
	nb++
	}
	return string(b[0:nb])
	}

	func TestReaderSimple(t *testing.T) {
	data := "hello world"
	b := NewReader(bytes.NewBufferString(data))
	if s := readBytes(b); s != "hello world" {
	t.Errorf("simple hello world test failed: got %q", s)
	}

	b = NewReader(newRot13Reader(bytes.NewBufferString(data)))
	if s := readBytes(b); s != "uryyb jbeyq" {
	t.Error("rot13 hello world test failed: got %q", s)
	}
	}


	type readMaker struct {
	name string
	fn func(io.Reader) io.Reader
	}

	var readMakers = []readMaker{
	readMaker{"full", func(r io.Reader) io.Reader { return r }},
	readMaker{"byte", iotest.OneByteReader},
	readMaker{"half", iotest.HalfReader},
	readMaker{"data+err", iotest.DataErrReader},
	}

	// Call ReadString (which ends up calling everything else)
	// to accumulate the text of a file.
	func readLines(b *Reader) string {
	s := ""
	for {
	s1, e := b.ReadString('\n')
	if e == os.EOF {
	break
	}
	if e != nil {
	panic("GetLines: " + e.String())
	}
	s += s1
	}
	return s
	}

	// Call Read to accumulate the text of a file
	func reads(buf *Reader, m int) string {
	var b [1000]byte
	nb := 0
	for {
	n, e := buf.Read(b[nb : nb+m])
	nb += n
	if e == os.EOF {
	break
	}
	}
	return string(b[0:nb])
	}

	type bufReader struct {
	name string
	fn func(*Reader) string
	}

	var bufreaders = []bufReader{
	bufReader{"1", func(b *Reader) string { return reads(b, 1) }},
	bufReader{"2", func(b *Reader) string { return reads(b, 2) }},
	bufReader{"3", func(b *Reader) string { return reads(b, 3) }},
	bufReader{"4", func(b *Reader) string { return reads(b, 4) }},
	bufReader{"5", func(b *Reader) string { return reads(b, 5) }},
	bufReader{"7", func(b *Reader) string { return reads(b, 7) }},
	bufReader{"bytes", readBytes},
	bufReader{"lines", readLines},
	}

	var bufsizes = []int{
	1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
	23, 32, 46, 64, 93, 128, 1024, 4096,
	}

	func TestReader(t *testing.T) {
	var texts [31]string
	str := ""
	all := ""
	for i := 0; i < len(texts)-1; i++ {
	texts[i] = str + "\n"
	all += texts[i]
	str += string(i%26 + 'a')
	}
	texts[len(texts)-1] = all

	for h := 0; h < len(texts); h++ {
	text := texts[h]
	for i := 0; i < len(readMakers); i++ {
	for j := 0; j < len(bufreaders); j++ {
	for k := 0; k < len(bufsizes); k++ {
	readmaker := readMakers[i]
	bufreader := bufreaders[j]
	bufsize := bufsizes[k]
	read := readmaker.fn(bytes.NewBufferString(text))
	buf, _ := NewReaderSize(read, bufsize)
	s := bufreader.fn(buf)
	if s != text {
	t.Errorf("reader=%s fn=%s bufsize=%d want=%q got=%q",
	readmaker.name, bufreader.name, bufsize, text, s)
	}
	}
	}
	}
	}
	}

	// A StringReader delivers its data one string segment at a time via Read.
	type StringReader struct {
	data []string
	step int
	}

	func (r *StringReader) Read(p []byte) (n int, err os.Error) {
	if r.step < len(r.data) {
	s := r.data[r.step]
	for i := 0; i < len(s); i++ {
	p[i] = s[i]
	}
	n = len(s)
	r.step++
	} else {
	err = os.EOF
	}
	return
	}

	func readRuneSegments(t *testing.T, segments []string) {
	got := ""
	want := strings.Join(segments, "")
	r := NewReader(&StringReader{data: segments})
	for {
	rune, _, err := r.ReadRune()
	if err != nil {
	if err != os.EOF {
	return
	}
	break
	}
	got += string(rune)
	}
	if got != want {
	t.Errorf("segments=%v got=%s want=%s", segments, got, want)
	}
	}

	var segmentList = [][]string{
	[]string{},
	[]string{""},
	[]string{"日", "本語"},
	[]string{"\u65e5", "\u672c", "\u8a9e"},
	[]string{"\U000065e5", "\U0000672c", "\U00008a9e"},
	[]string{"\xe6", "\x97\xa5\xe6", "\x9c\xac\xe8\xaa\x9e"},
	[]string{"Hello", ", ", "World", "!"},
	[]string{"Hello", ", ", "", "World", "!"},
	}

	func TestReadRune(t *testing.T) {
	for _, s := range segmentList {
	readRuneSegments(t, s)
	}
	}

	func TestReadWriteRune(t *testing.T) {
	const NRune = 1000
	byteBuf := new(bytes.Buffer)
	w := NewWriter(byteBuf)
	// Write the runes out using WriteRune
	buf := make([]byte, utf8.UTFMax)
	for rune := 0; rune < NRune; rune++ {
	size := utf8.EncodeRune(rune, buf)
	nbytes, err := w.WriteRune(rune)
	if err != nil {
	t.Fatalf("WriteRune(0x%x) error: %s", rune, err)
	}
	if nbytes != size {
	t.Fatalf("WriteRune(0x%x) expected %d, got %d", rune, size, nbytes)
	}
	}
	w.Flush()

	r := NewReader(byteBuf)
	// Read them back with ReadRune
	for rune := 0; rune < NRune; rune++ {
	size := utf8.EncodeRune(rune, buf)
	nr, nbytes, err := r.ReadRune()
	if nr != rune \|\| nbytes != size \|\| err != nil {
	t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r, nr, nbytes, r, size, err)
	}
	}
	}

	func TestWriter(t *testing.T) {
	var data [8192]byte

	for i := 0; i < len(data); i++ {
	data[i] = byte(' ' + i%('~'-' '))
	}
	w := new(bytes.Buffer)
	for i := 0; i < len(bufsizes); i++ {
	for j := 0; j < len(bufsizes); j++ {
	nwrite := bufsizes[i]
	bs := bufsizes[j]

	// Write nwrite bytes using buffer size bs.
	// Check that the right amount makes it out
	// and that the data is correct.

	w.Reset()
	buf, e := NewWriterSize(w, bs)
	context := fmt.Sprintf("nwrite=%d bufsize=%d", nwrite, bs)
	if e != nil {
	t.Errorf("%s: NewWriterSize %d: %v", context, bs, e)
	continue
	}
	n, e1 := buf.Write(data[0:nwrite])
	if e1 != nil \|\| n != nwrite {
	t.Errorf("%s: buf.Write %d = %d, %v", context, nwrite, n, e1)
	continue
	}
	if e = buf.Flush(); e != nil {
	t.Errorf("%s: buf.Flush = %v", context, e)
	}

	written := w.Bytes()
	if len(written) != nwrite {
	t.Errorf("%s: %d bytes written", context, len(written))
	}
	for l := 0; l < len(written); l++ {
	if written[i] != data[i] {
	t.Errorf("%s: wrong bytes written")
	t.Errorf("want=%s", data[0:len(written)])
	t.Errorf("have=%s", written)
	}
	}
	}
	}
	}

	// Check that write errors are returned properly.

	type errorWriterTest struct {
	n, m int
	err os.Error
	expect os.Error
	}

	func (w errorWriterTest) Write(p []byte) (int, os.Error) {
	return len(p) * w.n / w.m, w.err
	}

	var errorWriterTests = []errorWriterTest{
	errorWriterTest{0, 1, nil, io.ErrShortWrite},
	errorWriterTest{1, 2, nil, io.ErrShortWrite},
	errorWriterTest{1, 1, nil, nil},
	errorWriterTest{0, 1, os.EPIPE, os.EPIPE},
	errorWriterTest{1, 2, os.EPIPE, os.EPIPE},
	errorWriterTest{1, 1, os.EPIPE, os.EPIPE},
	}

	func TestWriteErrors(t *testing.T) {
	for _, w := range errorWriterTests {
	buf := NewWriter(w)
	_, e := buf.Write([]byte("hello world"))
	if e != nil {
	t.Errorf("Write hello to %v: %v", w, e)
	continue
	}
	e = buf.Flush()
	if e != w.expect {
	t.Errorf("Flush %v: got %v, wanted %v", w, e, w.expect)
	}
	}
	}

	func TestNewReaderSizeIdempotent(t *testing.T) {
	const BufSize = 1000
	b, err := NewReaderSize(bytes.NewBufferString("hello world"), BufSize)
	if err != nil {
	t.Error("NewReaderSize create fail", err)
	}
	// Does it recognize itself?
	b1, err2 := NewReaderSize(b, BufSize)
	if err2 != nil {
	t.Error("NewReaderSize #2 create fail", err2)
	}
	if b1 != b {
	t.Error("NewReaderSize did not detect underlying Reader")
	}
	// Does it wrap if existing buffer is too small?
	b2, err3 := NewReaderSize(b, 2*BufSize)
	if err3 != nil {
	t.Error("NewReaderSize #3 create fail", err3)
	}
	if b2 == b {
	t.Error("NewReaderSize did not enlarge buffer")
	}
	}

	func TestNewWriterSizeIdempotent(t *testing.T) {
	const BufSize = 1000
	b, err := NewWriterSize(new(bytes.Buffer), BufSize)
	if err != nil {
	t.Error("NewWriterSize create fail", err)
	}
	// Does it recognize itself?
	b1, err2 := NewWriterSize(b, BufSize)
	if err2 != nil {
	t.Error("NewWriterSize #2 create fail", err2)
	}
	if b1 != b {
	t.Error("NewWriterSize did not detect underlying Writer")
	}
	// Does it wrap if existing buffer is too small?
	b2, err3 := NewWriterSize(b, 2*BufSize)
	if err3 != nil {
	t.Error("NewWriterSize #3 create fail", err3)
	}
	if b2 == b {
	t.Error("NewWriterSize did not enlarge buffer")
	}
	}

	func TestWriteString(t *testing.T) {
	const BufSize = 8
	buf := new(bytes.Buffer)
	b, err := NewWriterSize(buf, BufSize)
	if err != nil {
	t.Error("NewWriterSize create fail", err)
	}
	b.WriteString("0") // easy
	b.WriteString("123456") // still easy
	b.WriteString("7890") // easy after flush
	b.WriteString("abcdefghijklmnopqrstuvwxy") // hard
	b.WriteString("z")
	b.Flush()
	if b.err != nil {
	t.Error("WriteString", b.err)
	}
	s := "01234567890abcdefghijklmnopqrstuvwxyz"
	if string(buf.Bytes()) != s {
	t.Errorf("WriteString wants %q gets %q", s, string(buf.Bytes()))
	}
	}