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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [bytes/] [buffer_test.go] - Blame information for rev 833

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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 bytes_test
 
import (
        . "bytes"
        "io"
        "math/rand"
        "testing"
        "unicode/utf8"
)
 
const N = 10000  // make this bigger for a larger (and slower) test
var data string  // test data for write tests
var bytes []byte // test data; same as data but as a slice.
 
func init() {
        bytes = make([]byte, N)
        for i := 0; i < N; i++ {
                bytes[i] = 'a' + byte(i%26)
        }
        data = string(bytes)
}
 
// Verify that contents of buf match the string s.
func check(t *testing.T, testname string, buf *Buffer, s string) {
        bytes := buf.Bytes()
        str := buf.String()
        if buf.Len() != len(bytes) {
                t.Errorf("%s: buf.Len() == %d, len(buf.Bytes()) == %d", testname, buf.Len(), len(bytes))
        }
 
        if buf.Len() != len(str) {
                t.Errorf("%s: buf.Len() == %d, len(buf.String()) == %d", testname, buf.Len(), len(str))
        }
 
        if buf.Len() != len(s) {
                t.Errorf("%s: buf.Len() == %d, len(s) == %d", testname, buf.Len(), len(s))
        }
 
        if string(bytes) != s {
                t.Errorf("%s: string(buf.Bytes()) == %q, s == %q", testname, string(bytes), s)
        }
}
 
// Fill buf through n writes of string fus.
// The initial contents of buf corresponds to the string s;
// the result is the final contents of buf returned as a string.
func fillString(t *testing.T, testname string, buf *Buffer, s string, n int, fus string) string {
        check(t, testname+" (fill 1)", buf, s)
        for ; n > 0; n-- {
                m, err := buf.WriteString(fus)
                if m != len(fus) {
                        t.Errorf(testname+" (fill 2): m == %d, expected %d", m, len(fus))
                }
                if err != nil {
                        t.Errorf(testname+" (fill 3): err should always be nil, found err == %s", err)
                }
                s += fus
                check(t, testname+" (fill 4)", buf, s)
        }
        return s
}
 
// Fill buf through n writes of byte slice fub.
// The initial contents of buf corresponds to the string s;
// the result is the final contents of buf returned as a string.
func fillBytes(t *testing.T, testname string, buf *Buffer, s string, n int, fub []byte) string {
        check(t, testname+" (fill 1)", buf, s)
        for ; n > 0; n-- {
                m, err := buf.Write(fub)
                if m != len(fub) {
                        t.Errorf(testname+" (fill 2): m == %d, expected %d", m, len(fub))
                }
                if err != nil {
                        t.Errorf(testname+" (fill 3): err should always be nil, found err == %s", err)
                }
                s += string(fub)
                check(t, testname+" (fill 4)", buf, s)
        }
        return s
}
 
func TestNewBuffer(t *testing.T) {
        buf := NewBuffer(bytes)
        check(t, "NewBuffer", buf, data)
}
 
func TestNewBufferString(t *testing.T) {
        buf := NewBufferString(data)
        check(t, "NewBufferString", buf, data)
}
 
// Empty buf through repeated reads into fub.
// The initial contents of buf corresponds to the string s.
func empty(t *testing.T, testname string, buf *Buffer, s string, fub []byte) {
        check(t, testname+" (empty 1)", buf, s)
 
        for {
                n, err := buf.Read(fub)
                if n == 0 {
                        break
                }
                if err != nil {
                        t.Errorf(testname+" (empty 2): err should always be nil, found err == %s", err)
                }
                s = s[n:]
                check(t, testname+" (empty 3)", buf, s)
        }
 
        check(t, testname+" (empty 4)", buf, "")
}
 
func TestBasicOperations(t *testing.T) {
        var buf Buffer
 
        for i := 0; i < 5; i++ {
                check(t, "TestBasicOperations (1)", &buf, "")
 
                buf.Reset()
                check(t, "TestBasicOperations (2)", &buf, "")
 
                buf.Truncate(0)
                check(t, "TestBasicOperations (3)", &buf, "")
 
                n, err := buf.Write([]byte(data[0:1]))
                if n != 1 {
                        t.Errorf("wrote 1 byte, but n == %d", n)
                }
                if err != nil {
                        t.Errorf("err should always be nil, but err == %s", err)
                }
                check(t, "TestBasicOperations (4)", &buf, "a")
 
                buf.WriteByte(data[1])
                check(t, "TestBasicOperations (5)", &buf, "ab")
 
                n, err = buf.Write([]byte(data[2:26]))
                if n != 24 {
                        t.Errorf("wrote 25 bytes, but n == %d", n)
                }
                check(t, "TestBasicOperations (6)", &buf, string(data[0:26]))
 
                buf.Truncate(26)
                check(t, "TestBasicOperations (7)", &buf, string(data[0:26]))
 
                buf.Truncate(20)
                check(t, "TestBasicOperations (8)", &buf, string(data[0:20]))
 
                empty(t, "TestBasicOperations (9)", &buf, string(data[0:20]), make([]byte, 5))
                empty(t, "TestBasicOperations (10)", &buf, "", make([]byte, 100))
 
                buf.WriteByte(data[1])
                c, err := buf.ReadByte()
                if err != nil {
                        t.Error("ReadByte unexpected eof")
                }
                if c != data[1] {
                        t.Errorf("ReadByte wrong value c=%v", c)
                }
                c, err = buf.ReadByte()
                if err == nil {
                        t.Error("ReadByte unexpected not eof")
                }
        }
}
 
func TestLargeStringWrites(t *testing.T) {
        var buf Buffer
        limit := 30
        if testing.Short() {
                limit = 9
        }
        for i := 3; i < limit; i += 3 {
                s := fillString(t, "TestLargeWrites (1)", &buf, "", 5, data)
                empty(t, "TestLargeStringWrites (2)", &buf, s, make([]byte, len(data)/i))
        }
        check(t, "TestLargeStringWrites (3)", &buf, "")
}
 
func TestLargeByteWrites(t *testing.T) {
        var buf Buffer
        limit := 30
        if testing.Short() {
                limit = 9
        }
        for i := 3; i < limit; i += 3 {
                s := fillBytes(t, "TestLargeWrites (1)", &buf, "", 5, bytes)
                empty(t, "TestLargeByteWrites (2)", &buf, s, make([]byte, len(data)/i))
        }
        check(t, "TestLargeByteWrites (3)", &buf, "")
}
 
func TestLargeStringReads(t *testing.T) {
        var buf Buffer
        for i := 3; i < 30; i += 3 {
                s := fillString(t, "TestLargeReads (1)", &buf, "", 5, data[0:len(data)/i])
                empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)))
        }
        check(t, "TestLargeStringReads (3)", &buf, "")
}
 
func TestLargeByteReads(t *testing.T) {
        var buf Buffer
        for i := 3; i < 30; i += 3 {
                s := fillBytes(t, "TestLargeReads (1)", &buf, "", 5, bytes[0:len(bytes)/i])
                empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)))
        }
        check(t, "TestLargeByteReads (3)", &buf, "")
}
 
func TestMixedReadsAndWrites(t *testing.T) {
        var buf Buffer
        s := ""
        for i := 0; i < 50; i++ {
                wlen := rand.Intn(len(data))
                if i%2 == 0 {
                        s = fillString(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, data[0:wlen])
                } else {
                        s = fillBytes(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, bytes[0:wlen])
                }
 
                rlen := rand.Intn(len(data))
                fub := make([]byte, rlen)
                n, _ := buf.Read(fub)
                s = s[n:]
        }
        empty(t, "TestMixedReadsAndWrites (2)", &buf, s, make([]byte, buf.Len()))
}
 
func TestNil(t *testing.T) {
        var b *Buffer
        if b.String() != "" {
                t.Errorf("expected ; got %q", b.String())
        }
}
 
func TestReadFrom(t *testing.T) {
        var buf Buffer
        for i := 3; i < 30; i += 3 {
                s := fillBytes(t, "TestReadFrom (1)", &buf, "", 5, bytes[0:len(bytes)/i])
                var b Buffer
                b.ReadFrom(&buf)
                empty(t, "TestReadFrom (2)", &b, s, make([]byte, len(data)))
        }
}
 
func TestWriteTo(t *testing.T) {
        var buf Buffer
        for i := 3; i < 30; i += 3 {
                s := fillBytes(t, "TestReadFrom (1)", &buf, "", 5, bytes[0:len(bytes)/i])
                var b Buffer
                buf.WriteTo(&b)
                empty(t, "TestReadFrom (2)", &b, s, make([]byte, len(data)))
        }
}
 
func TestRuneIO(t *testing.T) {
        const NRune = 1000
        // Built a test array while we write the data
        b := make([]byte, utf8.UTFMax*NRune)
        var buf Buffer
        n := 0
        for r := rune(0); r < NRune; r++ {
                size := utf8.EncodeRune(b[n:], r)
                nbytes, err := buf.WriteRune(r)
                if err != nil {
                        t.Fatalf("WriteRune(%U) error: %s", r, err)
                }
                if nbytes != size {
                        t.Fatalf("WriteRune(%U) expected %d, got %d", r, size, nbytes)
                }
                n += size
        }
        b = b[0:n]
 
        // Check the resulting bytes
        if !Equal(buf.Bytes(), b) {
                t.Fatalf("incorrect result from WriteRune: %q not %q", buf.Bytes(), b)
        }
 
        p := make([]byte, utf8.UTFMax)
        // Read it back with ReadRune
        for r := rune(0); r < NRune; r++ {
                size := utf8.EncodeRune(p, r)
                nr, nbytes, err := buf.ReadRune()
                if nr != r || nbytes != size || err != nil {
                        t.Fatalf("ReadRune(%U) got %U,%d not %U,%d (err=%s)", r, nr, nbytes, r, size, err)
                }
        }
 
        // Check that UnreadRune works
        buf.Reset()
        buf.Write(b)
        for r := rune(0); r < NRune; r++ {
                r1, size, _ := buf.ReadRune()
                if err := buf.UnreadRune(); err != nil {
                        t.Fatalf("UnreadRune(%U) got error %q", r, err)
                }
                r2, nbytes, err := buf.ReadRune()
                if r1 != r2 || r1 != r || nbytes != size || err != nil {
                        t.Fatalf("ReadRune(%U) after UnreadRune got %U,%d not %U,%d (err=%s)", r, r2, nbytes, r, size, err)
                }
        }
}
 
func TestNext(t *testing.T) {
        b := []byte{0, 1, 2, 3, 4}
        tmp := make([]byte, 5)
        for i := 0; i <= 5; i++ {
                for j := i; j <= 5; j++ {
                        for k := 0; k <= 6; k++ {
                                // 0 <= i <= j <= 5; 0 <= k <= 6
                                // Check that if we start with a buffer
                                // of length j at offset i and ask for
                                // Next(k), we get the right bytes.
                                buf := NewBuffer(b[0:j])
                                n, _ := buf.Read(tmp[0:i])
                                if n != i {
                                        t.Fatalf("Read %d returned %d", i, n)
                                }
                                bb := buf.Next(k)
                                want := k
                                if want > j-i {
                                        want = j - i
                                }
                                if len(bb) != want {
                                        t.Fatalf("in %d,%d: len(Next(%d)) == %d", i, j, k, len(bb))
                                }
                                for l, v := range bb {
                                        if v != byte(l+i) {
                                                t.Fatalf("in %d,%d: Next(%d)[%d] = %d, want %d", i, j, k, l, v, l+i)
                                        }
                                }
                        }
                }
        }
}
 
var readBytesTests = []struct {
        buffer   string
        delim    byte
        expected []string
        err      error
}{
        {"", 0, []string{""}, io.EOF},
        {"a\x00", 0, []string{"a\x00"}, nil},
        {"abbbaaaba", 'b', []string{"ab", "b", "b", "aaab"}, nil},
        {"hello\x01world", 1, []string{"hello\x01"}, nil},
        {"foo\nbar", 0, []string{"foo\nbar"}, io.EOF},
        {"alpha\nbeta\ngamma\n", '\n', []string{"alpha\n", "beta\n", "gamma\n"}, nil},
        {"alpha\nbeta\ngamma", '\n', []string{"alpha\n", "beta\n", "gamma"}, io.EOF},
}
 
func TestReadBytes(t *testing.T) {
        for _, test := range readBytesTests {
                buf := NewBufferString(test.buffer)
                var err error
                for _, expected := range test.expected {
                        var bytes []byte
                        bytes, err = buf.ReadBytes(test.delim)
                        if string(bytes) != expected {
                                t.Errorf("expected %q, got %q", expected, bytes)
                        }
                        if err != nil {
                                break
                        }
                }
                if err != test.err {
                        t.Errorf("expected error %v, got %v", test.err, err)
                }
        }
}
 
// Was a bug: used to give EOF reading empty slice at EOF.
func TestReadEmptyAtEOF(t *testing.T) {
        b := new(Buffer)
        slice := make([]byte, 0)
        n, err := b.Read(slice)
        if err != nil {
                t.Errorf("read error: %v", err)
        }
        if n != 0 {
                t.Errorf("wrong count; got %d want 0", n)
        }
}

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Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [bytes/] [buffer_test.go] - Blame information for rev 833

Line No.	Rev	Author	Line
1	747	jeremybenn	`// 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 bytes_test`
6
7			`import (`
8			`. "bytes"`
9			`"io"`
10			`"math/rand"`
11			`"testing"`
12			`"unicode/utf8"`
13			`)`
14
15			`const N = 10000 // make this bigger for a larger (and slower) test`
16			`var data string // test data for write tests`
17			`var bytes []byte // test data; same as data but as a slice.`
18
19			`func init() {`
20			`bytes = make([]byte, N)`
21			`for i := 0; i < N; i++ {`
22			`bytes[i] = 'a' + byte(i%26)`
23			`}`
24			`data = string(bytes)`
25			`}`
26
27			`// Verify that contents of buf match the string s.`
28			`func check(t testing.T, testname string, buf Buffer, s string) {`
29			`bytes := buf.Bytes()`
30			`str := buf.String()`
31			`if buf.Len() != len(bytes) {`
32			`t.Errorf("%s: buf.Len() == %d, len(buf.Bytes()) == %d", testname, buf.Len(), len(bytes))`
33			`}`
34
35			`if buf.Len() != len(str) {`
36			`t.Errorf("%s: buf.Len() == %d, len(buf.String()) == %d", testname, buf.Len(), len(str))`
37			`}`
38
39			`if buf.Len() != len(s) {`
40			`t.Errorf("%s: buf.Len() == %d, len(s) == %d", testname, buf.Len(), len(s))`
41			`}`
42
43			`if string(bytes) != s {`
44			`t.Errorf("%s: string(buf.Bytes()) == %q, s == %q", testname, string(bytes), s)`
45			`}`
46			`}`
47
48			`// Fill buf through n writes of string fus.`
49			`// The initial contents of buf corresponds to the string s;`
50			`// the result is the final contents of buf returned as a string.`
51			`func fillString(t testing.T, testname string, buf Buffer, s string, n int, fus string) string {`
52			`check(t, testname+" (fill 1)", buf, s)`
53			`for ; n > 0; n-- {`
54			`m, err := buf.WriteString(fus)`
55			`if m != len(fus) {`
56			`t.Errorf(testname+" (fill 2): m == %d, expected %d", m, len(fus))`
57			`}`
58			`if err != nil {`
59			`t.Errorf(testname+" (fill 3): err should always be nil, found err == %s", err)`
60			`}`
61			`s += fus`
62			`check(t, testname+" (fill 4)", buf, s)`
63			`}`
64			`return s`
65			`}`
66
67			`// Fill buf through n writes of byte slice fub.`
68			`// The initial contents of buf corresponds to the string s;`
69			`// the result is the final contents of buf returned as a string.`
70			`func fillBytes(t testing.T, testname string, buf Buffer, s string, n int, fub []byte) string {`
71			`check(t, testname+" (fill 1)", buf, s)`
72			`for ; n > 0; n-- {`
73			`m, err := buf.Write(fub)`
74			`if m != len(fub) {`
75			`t.Errorf(testname+" (fill 2): m == %d, expected %d", m, len(fub))`
76			`}`
77			`if err != nil {`
78			`t.Errorf(testname+" (fill 3): err should always be nil, found err == %s", err)`
79			`}`
80			`s += string(fub)`
81			`check(t, testname+" (fill 4)", buf, s)`
82			`}`
83			`return s`
84			`}`
85
86			`func TestNewBuffer(t *testing.T) {`
87			`buf := NewBuffer(bytes)`
88			`check(t, "NewBuffer", buf, data)`
89			`}`
90
91			`func TestNewBufferString(t *testing.T) {`
92			`buf := NewBufferString(data)`
93			`check(t, "NewBufferString", buf, data)`
94			`}`
95
96			`// Empty buf through repeated reads into fub.`
97			`// The initial contents of buf corresponds to the string s.`
98			`func empty(t testing.T, testname string, buf Buffer, s string, fub []byte) {`
99			`check(t, testname+" (empty 1)", buf, s)`
100
101			`for {`
102			`n, err := buf.Read(fub)`
103			`if n == 0 {`
104			`break`
105			`}`
106			`if err != nil {`
107			`t.Errorf(testname+" (empty 2): err should always be nil, found err == %s", err)`
108			`}`
109			`s = s[n:]`
110			`check(t, testname+" (empty 3)", buf, s)`
111			`}`
112
113			`check(t, testname+" (empty 4)", buf, "")`
114			`}`
115
116			`func TestBasicOperations(t *testing.T) {`
117			`var buf Buffer`
118
119			`for i := 0; i < 5; i++ {`
120			`check(t, "TestBasicOperations (1)", &buf, "")`
121
122			`buf.Reset()`
123			`check(t, "TestBasicOperations (2)", &buf, "")`
124
125			`buf.Truncate(0)`
126			`check(t, "TestBasicOperations (3)", &buf, "")`
127
128			`n, err := buf.Write([]byte(data[0:1]))`
129			`if n != 1 {`
130			`t.Errorf("wrote 1 byte, but n == %d", n)`
131			`}`
132			`if err != nil {`
133			`t.Errorf("err should always be nil, but err == %s", err)`
134			`}`
135			`check(t, "TestBasicOperations (4)", &buf, "a")`
136
137			`buf.WriteByte(data[1])`
138			`check(t, "TestBasicOperations (5)", &buf, "ab")`
139
140			`n, err = buf.Write([]byte(data[2:26]))`
141			`if n != 24 {`
142			`t.Errorf("wrote 25 bytes, but n == %d", n)`
143			`}`
144			`check(t, "TestBasicOperations (6)", &buf, string(data[0:26]))`
145
146			`buf.Truncate(26)`
147			`check(t, "TestBasicOperations (7)", &buf, string(data[0:26]))`
148
149			`buf.Truncate(20)`
150			`check(t, "TestBasicOperations (8)", &buf, string(data[0:20]))`
151
152			`empty(t, "TestBasicOperations (9)", &buf, string(data[0:20]), make([]byte, 5))`
153			`empty(t, "TestBasicOperations (10)", &buf, "", make([]byte, 100))`
154
155			`buf.WriteByte(data[1])`
156			`c, err := buf.ReadByte()`
157			`if err != nil {`
158			`t.Error("ReadByte unexpected eof")`
159			`}`
160			`if c != data[1] {`
161			`t.Errorf("ReadByte wrong value c=%v", c)`
162			`}`
163			`c, err = buf.ReadByte()`
164			`if err == nil {`
165			`t.Error("ReadByte unexpected not eof")`
166			`}`
167			`}`
168			`}`
169
170			`func TestLargeStringWrites(t *testing.T) {`
171			`var buf Buffer`
172			`limit := 30`
173			`if testing.Short() {`
174			`limit = 9`
175			`}`
176			`for i := 3; i < limit; i += 3 {`
177			`s := fillString(t, "TestLargeWrites (1)", &buf, "", 5, data)`
178			`empty(t, "TestLargeStringWrites (2)", &buf, s, make([]byte, len(data)/i))`
179			`}`
180			`check(t, "TestLargeStringWrites (3)", &buf, "")`
181			`}`
182
183			`func TestLargeByteWrites(t *testing.T) {`
184			`var buf Buffer`
185			`limit := 30`
186			`if testing.Short() {`
187			`limit = 9`
188			`}`
189			`for i := 3; i < limit; i += 3 {`
190			`s := fillBytes(t, "TestLargeWrites (1)", &buf, "", 5, bytes)`
191			`empty(t, "TestLargeByteWrites (2)", &buf, s, make([]byte, len(data)/i))`
192			`}`
193			`check(t, "TestLargeByteWrites (3)", &buf, "")`
194			`}`
195
196			`func TestLargeStringReads(t *testing.T) {`
197			`var buf Buffer`
198			`for i := 3; i < 30; i += 3 {`
199			`s := fillString(t, "TestLargeReads (1)", &buf, "", 5, data[0:len(data)/i])`
200			`empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)))`
201			`}`
202			`check(t, "TestLargeStringReads (3)", &buf, "")`
203			`}`
204
205			`func TestLargeByteReads(t *testing.T) {`
206			`var buf Buffer`
207			`for i := 3; i < 30; i += 3 {`
208			`s := fillBytes(t, "TestLargeReads (1)", &buf, "", 5, bytes[0:len(bytes)/i])`
209			`empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)))`
210			`}`
211			`check(t, "TestLargeByteReads (3)", &buf, "")`
212			`}`
213
214			`func TestMixedReadsAndWrites(t *testing.T) {`
215			`var buf Buffer`
216			`s := ""`
217			`for i := 0; i < 50; i++ {`
218			`wlen := rand.Intn(len(data))`
219			`if i%2 == 0 {`
220			`s = fillString(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, data[0:wlen])`
221			`} else {`
222			`s = fillBytes(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, bytes[0:wlen])`
223			`}`
224
225			`rlen := rand.Intn(len(data))`
226			`fub := make([]byte, rlen)`
227			`n, _ := buf.Read(fub)`
228			`s = s[n:]`
229			`}`
230			`empty(t, "TestMixedReadsAndWrites (2)", &buf, s, make([]byte, buf.Len()))`
231			`}`
232
233			`func TestNil(t *testing.T) {`
234			`var b *Buffer`
235			`if b.String() != "" {`
236			`t.Errorf("expected ; got %q", b.String())`
237			`}`
238			`}`
239
240			`func TestReadFrom(t *testing.T) {`
241			`var buf Buffer`
242			`for i := 3; i < 30; i += 3 {`
243			`s := fillBytes(t, "TestReadFrom (1)", &buf, "", 5, bytes[0:len(bytes)/i])`
244			`var b Buffer`
245			`b.ReadFrom(&buf)`
246			`empty(t, "TestReadFrom (2)", &b, s, make([]byte, len(data)))`
247			`}`
248			`}`
249
250			`func TestWriteTo(t *testing.T) {`
251			`var buf Buffer`
252			`for i := 3; i < 30; i += 3 {`
253			`s := fillBytes(t, "TestReadFrom (1)", &buf, "", 5, bytes[0:len(bytes)/i])`
254			`var b Buffer`
255			`buf.WriteTo(&b)`
256			`empty(t, "TestReadFrom (2)", &b, s, make([]byte, len(data)))`
257			`}`
258			`}`
259
260			`func TestRuneIO(t *testing.T) {`
261			`const NRune = 1000`
262			`// Built a test array while we write the data`
263			`b := make([]byte, utf8.UTFMax*NRune)`
264			`var buf Buffer`
265			`n := 0`
266			`for r := rune(0); r < NRune; r++ {`
267			`size := utf8.EncodeRune(b[n:], r)`
268			`nbytes, err := buf.WriteRune(r)`
269			`if err != nil {`
270			`t.Fatalf("WriteRune(%U) error: %s", r, err)`
271			`}`
272			`if nbytes != size {`
273			`t.Fatalf("WriteRune(%U) expected %d, got %d", r, size, nbytes)`
274			`}`
275			`n += size`
276			`}`
277			`b = b[0:n]`
278
279			`// Check the resulting bytes`
280			`if !Equal(buf.Bytes(), b) {`
281			`t.Fatalf("incorrect result from WriteRune: %q not %q", buf.Bytes(), b)`
282			`}`
283
284			`p := make([]byte, utf8.UTFMax)`
285			`// Read it back with ReadRune`
286			`for r := rune(0); r < NRune; r++ {`
287			`size := utf8.EncodeRune(p, r)`
288			`nr, nbytes, err := buf.ReadRune()`
289			`if nr != r \|\| nbytes != size \|\| err != nil {`
290			`t.Fatalf("ReadRune(%U) got %U,%d not %U,%d (err=%s)", r, nr, nbytes, r, size, err)`
291			`}`
292			`}`
293
294			`// Check that UnreadRune works`
295			`buf.Reset()`
296			`buf.Write(b)`
297			`for r := rune(0); r < NRune; r++ {`
298			`r1, size, _ := buf.ReadRune()`
299			`if err := buf.UnreadRune(); err != nil {`
300			`t.Fatalf("UnreadRune(%U) got error %q", r, err)`
301			`}`
302			`r2, nbytes, err := buf.ReadRune()`
303			`if r1 != r2 \|\| r1 != r \|\| nbytes != size \|\| err != nil {`
304			`t.Fatalf("ReadRune(%U) after UnreadRune got %U,%d not %U,%d (err=%s)", r, r2, nbytes, r, size, err)`
305			`}`
306			`}`
307			`}`
308
309			`func TestNext(t *testing.T) {`
310			`b := []byte{0, 1, 2, 3, 4}`
311			`tmp := make([]byte, 5)`
312			`for i := 0; i <= 5; i++ {`
313			`for j := i; j <= 5; j++ {`
314			`for k := 0; k <= 6; k++ {`
315			`// 0 <= i <= j <= 5; 0 <= k <= 6`
316			`// Check that if we start with a buffer`
317			`// of length j at offset i and ask for`
318			`// Next(k), we get the right bytes.`
319			`buf := NewBuffer(b[0:j])`
320			`n, _ := buf.Read(tmp[0:i])`
321			`if n != i {`
322			`t.Fatalf("Read %d returned %d", i, n)`
323			`}`
324			`bb := buf.Next(k)`
325			`want := k`
326			`if want > j-i {`
327			`want = j - i`
328			`}`
329			`if len(bb) != want {`
330			`t.Fatalf("in %d,%d: len(Next(%d)) == %d", i, j, k, len(bb))`
331			`}`
332			`for l, v := range bb {`
333			`if v != byte(l+i) {`
334			`t.Fatalf("in %d,%d: Next(%d)[%d] = %d, want %d", i, j, k, l, v, l+i)`
335			`}`
336			`}`
337			`}`
338			`}`
339			`}`
340			`}`
341
342			`var readBytesTests = []struct {`
343			`buffer string`
344			`delim byte`
345			`expected []string`
346			`err error`
347			`}{`
348			`{"", 0, []string{""}, io.EOF},`
349			`{"a\x00", 0, []string{"a\x00"}, nil},`
350			`{"abbbaaaba", 'b', []string{"ab", "b", "b", "aaab"}, nil},`
351			`{"hello\x01world", 1, []string{"hello\x01"}, nil},`
352			`{"foo\nbar", 0, []string{"foo\nbar"}, io.EOF},`
353			`{"alpha\nbeta\ngamma\n", '\n', []string{"alpha\n", "beta\n", "gamma\n"}, nil},`
354			`{"alpha\nbeta\ngamma", '\n', []string{"alpha\n", "beta\n", "gamma"}, io.EOF},`
355			`}`
356
357			`func TestReadBytes(t *testing.T) {`
358			`for _, test := range readBytesTests {`
359			`buf := NewBufferString(test.buffer)`
360			`var err error`
361			`for _, expected := range test.expected {`
362			`var bytes []byte`
363			`bytes, err = buf.ReadBytes(test.delim)`
364			`if string(bytes) != expected {`
365			`t.Errorf("expected %q, got %q", expected, bytes)`
366			`}`
367			`if err != nil {`
368			`break`
369			`}`
370			`}`
371			`if err != test.err {`
372			`t.Errorf("expected error %v, got %v", test.err, err)`
373			`}`
374			`}`
375			`}`
376
377			`// Was a bug: used to give EOF reading empty slice at EOF.`
378			`func TestReadEmptyAtEOF(t *testing.T) {`
379			`b := new(Buffer)`
380			`slice := make([]byte, 0)`
381			`n, err := b.Read(slice)`
382			`if err != nil {`
383			`t.Errorf("read error: %v", err)`
384			`}`
385			`if n != 0 {`
386			`t.Errorf("wrong count; got %d want 0", n)`
387			`}`
388			`}`