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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";
)
const N = 10000; // make this bigger for a larger (and slower) test
var data []byte; // test data for write tests
func init() {
data = make([]byte, N);
for i := 0; i < len(data); i++ {
data[i] = 'a' + byte(i % 26)
}
}
// Verify that contents of buf match the string s.
func check(t *testing.T, testname string, buf *Buffer, s string) {
if buf.Len() != len(buf.Bytes()) {
t.Errorf("%s: buf.Len() == %d, len(buf.Bytes()) == %d\n", testname, buf.Len(), len(buf.Bytes()))
}
if buf.Len() != len(s) {
t.Errorf("%s: buf.Len() == %d, len(s) == %d\n", testname, buf.Len(), len(s))
}
if string(buf.Bytes()) != s {
t.Errorf("%s: string(buf.Bytes()) == %q, s == %q\n", testname, string(buf.Bytes()), s)
}
}
// Fill buf through n writes of fub.
// The initial contents of buf corresponds to the string s;
// the result is the final contents of buf returned as a string.
func fill(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\n", m, len(fub));
}
if err != nil {
t.Errorf(testname + " (fill 3): err should always be nil, found err == %s\n", err);
}
s += string(fub);
check(t, testname + " (fill 4)", buf, s);
}
return s;
}
// 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\n", err);
}
s = s[n : len(s)];
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(data[0 : 1]);
if n != 1 {
t.Errorf("wrote 1 byte, but n == %d\n", n);
}
if err != nil {
t.Errorf("err should always be nil, but err == %s\n", err);
}
check(t, "TestBasicOperations (4)", &buf, "a");
buf.WriteByte(data[1]);
check(t, "TestBasicOperations (5)", &buf, "ab");
n, err = buf.Write(data[2 : 26]);
if n != 24 {
t.Errorf("wrote 25 bytes, but n == %d\n", 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.Errorf("ReadByte unexpected eof\n");
}
if c != data[1] {
t.Errorf("ReadByte wrong value c=%v\n", c);
}
c, err = buf.ReadByte();
if err == nil {
t.Errorf("ReadByte unexpected not eof\n");
}
}
}
func TestLargeWrites(t *testing.T) {
var buf Buffer;
for i := 3; i < 30; i += 3 {
s := fill(t, "TestLargeWrites (1)", &buf, "", 5, data);
empty(t, "TestLargeWrites (2)", &buf, s, make([]byte, len(data)/i));
}
check(t, "TestLargeWrites (3)", &buf, "");
}
func TestLargeReads(t *testing.T) {
var buf Buffer;
for i := 3; i < 30; i += 3 {
s := fill(t, "TestLargeReads (1)", &buf, "", 5, data[0 : len(data)/i]);
empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)));
}
check(t, "TestLargeReads (3)", &buf, "");
}
func TestMixedReadsAndWrites(t *testing.T) {
var buf Buffer;
s := "";
for i := 0; i < 50; i++ {
wlen := rand.Intn(len(data));
s = fill(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, data[0 : wlen]);
rlen := rand.Intn(len(data));
fub := make([]byte, rlen);
n, _ := buf.Read(fub);
s = s[n : len(s)];
}
empty(t, "TestMixedReadsAndWrites (2)", &buf, s, make([]byte, buf.Len()));
}
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