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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"
"rand"
"testing"
"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
for i := 3; i < 30; 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
for i := 3; i < 30; 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() != "<nil>" {
t.Errorf("expcted <nil>; 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 := 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 := 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 := 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)
}
}
}
}
}
}
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