mirror of
https://github.com/golang/go
synced 2024-10-04 20:11:22 -06:00
40621d5c0d
R=rsc, r http://go/go-review/1025029
243 lines
6.2 KiB
Go
243 lines
6.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package bytes_test
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import (
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. "bytes";
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"rand";
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"testing";
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)
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const N = 10000 // make this bigger for a larger (and slower) test
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var data string // test data for write tests
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var bytes []byte // test data; same as data but as a slice.
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func init() {
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bytes = make([]byte, N);
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for i := 0; i < N; i++ {
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bytes[i] = 'a'+byte(i%26)
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}
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data = string(bytes);
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}
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// Verify that contents of buf match the string s.
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func check(t *testing.T, testname string, buf *Buffer, s string) {
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bytes := buf.Bytes();
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str := buf.String();
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if buf.Len() != len(bytes) {
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t.Errorf("%s: buf.Len() == %d, len(buf.Bytes()) == %d\n", testname, buf.Len(), len(bytes))
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}
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if buf.Len() != len(str) {
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t.Errorf("%s: buf.Len() == %d, len(buf.String()) == %d\n", testname, buf.Len(), len(str))
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}
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if buf.Len() != len(s) {
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t.Errorf("%s: buf.Len() == %d, len(s) == %d\n", testname, buf.Len(), len(s))
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}
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if string(bytes) != s {
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t.Errorf("%s: string(buf.Bytes()) == %q, s == %q\n", testname, string(bytes), s)
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}
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}
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// Fill buf through n writes of string fus.
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// The initial contents of buf corresponds to the string s;
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// the result is the final contents of buf returned as a string.
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func fillString(t *testing.T, testname string, buf *Buffer, s string, n int, fus string) string {
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check(t, testname + " (fill 1)", buf, s);
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for ; n > 0; n-- {
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m, err := buf.WriteString(fus);
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if m != len(fus) {
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t.Errorf(testname + " (fill 2): m == %d, expected %d\n", m, len(fus))
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}
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if err != nil {
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t.Errorf(testname + " (fill 3): err should always be nil, found err == %s\n", err)
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}
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s += fus;
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check(t, testname + " (fill 4)", buf, s);
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}
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return s;
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}
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// Fill buf through n writes of byte slice fub.
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// The initial contents of buf corresponds to the string s;
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// the result is the final contents of buf returned as a string.
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func fillBytes(t *testing.T, testname string, buf *Buffer, s string, n int, fub []byte) string {
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check(t, testname + " (fill 1)", buf, s);
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for ; n > 0; n-- {
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m, err := buf.Write(fub);
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if m != len(fub) {
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t.Errorf(testname + " (fill 2): m == %d, expected %d\n", m, len(fub))
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}
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if err != nil {
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t.Errorf(testname + " (fill 3): err should always be nil, found err == %s\n", err)
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}
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s += string(fub);
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check(t, testname + " (fill 4)", buf, s);
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}
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return s;
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}
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func TestNewBuffer(t *testing.T) {
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buf := NewBuffer(bytes);
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check(t, "NewBuffer", buf, data);
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}
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func TestNewBufferString(t *testing.T) {
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buf := NewBufferString(data);
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check(t, "NewBufferString", buf, data);
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}
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// Empty buf through repeated reads into fub.
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// The initial contents of buf corresponds to the string s.
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func empty(t *testing.T, testname string, buf *Buffer, s string, fub []byte) {
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check(t, testname + " (empty 1)", buf, s);
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for {
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n, err := buf.Read(fub);
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if n == 0 {
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break
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}
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if err != nil {
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t.Errorf(testname + " (empty 2): err should always be nil, found err == %s\n", err)
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}
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s = s[n:len(s)];
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check(t, testname + " (empty 3)", buf, s);
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}
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check(t, testname + " (empty 4)", buf, "");
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}
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func TestBasicOperations(t *testing.T) {
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var buf Buffer;
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for i := 0; i < 5; i++ {
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check(t, "TestBasicOperations (1)", &buf, "");
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buf.Reset();
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check(t, "TestBasicOperations (2)", &buf, "");
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buf.Truncate(0);
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check(t, "TestBasicOperations (3)", &buf, "");
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n, err := buf.Write(Bytes(data[0:1]));
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if n != 1 {
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t.Errorf("wrote 1 byte, but n == %d\n", n)
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}
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if err != nil {
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t.Errorf("err should always be nil, but err == %s\n", err)
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}
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check(t, "TestBasicOperations (4)", &buf, "a");
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buf.WriteByte(data[1]);
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check(t, "TestBasicOperations (5)", &buf, "ab");
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n, err = buf.Write(Bytes(data[2:26]));
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if n != 24 {
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t.Errorf("wrote 25 bytes, but n == %d\n", n)
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}
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check(t, "TestBasicOperations (6)", &buf, string(data[0:26]));
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buf.Truncate(26);
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check(t, "TestBasicOperations (7)", &buf, string(data[0:26]));
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buf.Truncate(20);
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check(t, "TestBasicOperations (8)", &buf, string(data[0:20]));
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empty(t, "TestBasicOperations (9)", &buf, string(data[0:20]), make([]byte, 5));
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empty(t, "TestBasicOperations (10)", &buf, "", make([]byte, 100));
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buf.WriteByte(data[1]);
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c, err := buf.ReadByte();
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if err != nil {
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t.Errorf("ReadByte unexpected eof\n")
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}
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if c != data[1] {
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t.Errorf("ReadByte wrong value c=%v\n", c)
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}
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c, err = buf.ReadByte();
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if err == nil {
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t.Errorf("ReadByte unexpected not eof\n")
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}
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}
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}
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func TestLargeStringWrites(t *testing.T) {
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var buf Buffer;
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for i := 3; i < 30; i += 3 {
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s := fillString(t, "TestLargeWrites (1)", &buf, "", 5, data);
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empty(t, "TestLargeStringWrites (2)", &buf, s, make([]byte, len(data)/i));
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}
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check(t, "TestLargeStringWrites (3)", &buf, "");
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}
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func TestLargeByteWrites(t *testing.T) {
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var buf Buffer;
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for i := 3; i < 30; i += 3 {
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s := fillBytes(t, "TestLargeWrites (1)", &buf, "", 5, bytes);
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empty(t, "TestLargeByteWrites (2)", &buf, s, make([]byte, len(data)/i));
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}
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check(t, "TestLargeByteWrites (3)", &buf, "");
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}
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func TestLargeStringReads(t *testing.T) {
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var buf Buffer;
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for i := 3; i < 30; i += 3 {
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s := fillString(t, "TestLargeReads (1)", &buf, "", 5, data[0 : len(data)/i]);
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empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)));
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}
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check(t, "TestLargeStringReads (3)", &buf, "");
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}
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func TestLargeByteReads(t *testing.T) {
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var buf Buffer;
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for i := 3; i < 30; i += 3 {
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s := fillBytes(t, "TestLargeReads (1)", &buf, "", 5, bytes[0 : len(bytes)/i]);
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empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)));
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}
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check(t, "TestLargeByteReads (3)", &buf, "");
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}
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func TestMixedReadsAndWrites(t *testing.T) {
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var buf Buffer;
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s := "";
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for i := 0; i < 50; i++ {
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wlen := rand.Intn(len(data));
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if i%2 == 0 {
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s = fillString(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, data[0:wlen])
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} else {
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s = fillBytes(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, bytes[0:wlen])
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}
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rlen := rand.Intn(len(data));
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fub := make([]byte, rlen);
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n, _ := buf.Read(fub);
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s = s[n:len(s)];
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}
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empty(t, "TestMixedReadsAndWrites (2)", &buf, s, make([]byte, buf.Len()));
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}
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func TestNil(t *testing.T) {
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var b *Buffer;
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if b.String() != "<nil>" {
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t.Error("expcted <nil>; got %q", b.String())
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}
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}
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