mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-11 19:49:32 +00:00
671 lines
17 KiB
Go
671 lines
17 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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"io"
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"math/rand"
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"runtime"
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"testing"
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"unicode/utf8"
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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 testString string // test data for write tests
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var testBytes []byte // test data; same as testString but as a slice.
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type negativeReader struct{}
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func (r *negativeReader) Read([]byte) (int, error) { return -1, nil }
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func init() {
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testBytes = make([]byte, N)
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for i := 0; i < N; i++ {
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testBytes[i] = 'a' + byte(i%26)
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}
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testString = string(testBytes)
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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", 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", 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", 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", 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", 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", 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", 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", 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(testBytes)
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check(t, "NewBuffer", buf, testString)
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}
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func TestNewBufferString(t *testing.T) {
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buf := NewBufferString(testString)
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check(t, "NewBufferString", buf, testString)
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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", err)
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}
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s = s[n:]
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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(testBytes[0:1])
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if n != 1 {
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t.Errorf("wrote 1 byte, but n == %d", 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", err)
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}
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check(t, "TestBasicOperations (4)", &buf, "a")
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buf.WriteByte(testString[1])
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check(t, "TestBasicOperations (5)", &buf, "ab")
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n, err = buf.Write(testBytes[2:26])
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if n != 24 {
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t.Errorf("wrote 24 bytes, but n == %d", n)
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}
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check(t, "TestBasicOperations (6)", &buf, testString[0:26])
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buf.Truncate(26)
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check(t, "TestBasicOperations (7)", &buf, testString[0:26])
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buf.Truncate(20)
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check(t, "TestBasicOperations (8)", &buf, testString[0:20])
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empty(t, "TestBasicOperations (9)", &buf, testString[0:20], make([]byte, 5))
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empty(t, "TestBasicOperations (10)", &buf, "", make([]byte, 100))
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buf.WriteByte(testString[1])
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c, err := buf.ReadByte()
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if err != nil {
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t.Error("ReadByte unexpected eof")
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}
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if c != testString[1] {
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t.Errorf("ReadByte wrong value c=%v", 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.Error("ReadByte unexpected not eof")
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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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limit := 30
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if testing.Short() {
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limit = 9
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}
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for i := 3; i < limit; i += 3 {
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s := fillString(t, "TestLargeWrites (1)", &buf, "", 5, testString)
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empty(t, "TestLargeStringWrites (2)", &buf, s, make([]byte, len(testString)/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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limit := 30
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if testing.Short() {
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limit = 9
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}
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for i := 3; i < limit; i += 3 {
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s := fillBytes(t, "TestLargeWrites (1)", &buf, "", 5, testBytes)
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empty(t, "TestLargeByteWrites (2)", &buf, s, make([]byte, len(testString)/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, testString[0:len(testString)/i])
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empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(testString)))
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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, testBytes[0:len(testBytes)/i])
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empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(testString)))
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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(testString))
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if i%2 == 0 {
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s = fillString(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, testString[0:wlen])
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} else {
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s = fillBytes(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, testBytes[0:wlen])
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}
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rlen := rand.Intn(len(testString))
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fub := make([]byte, rlen)
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n, _ := buf.Read(fub)
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s = s[n:]
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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 TestCapWithPreallocatedSlice(t *testing.T) {
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buf := NewBuffer(make([]byte, 10))
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n := buf.Cap()
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if n != 10 {
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t.Errorf("expected 10, got %d", n)
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}
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}
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func TestCapWithSliceAndWrittenData(t *testing.T) {
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buf := NewBuffer(make([]byte, 0, 10))
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buf.Write([]byte("test"))
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n := buf.Cap()
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if n != 10 {
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t.Errorf("expected 10, got %d", n)
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}
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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.Errorf("expected <nil>; got %q", b.String())
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}
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}
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func TestReadFrom(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, "TestReadFrom (1)", &buf, "", 5, testBytes[0:len(testBytes)/i])
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var b Buffer
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b.ReadFrom(&buf)
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empty(t, "TestReadFrom (2)", &b, s, make([]byte, len(testString)))
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}
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}
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type panicReader struct{ panic bool }
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func (r panicReader) Read(p []byte) (int, error) {
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if r.panic {
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panic(nil)
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}
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return 0, io.EOF
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}
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// Make sure that an empty Buffer remains empty when
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// it is "grown" before a Read that panics
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func TestReadFromPanicReader(t *testing.T) {
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// First verify non-panic behaviour
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var buf Buffer
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i, err := buf.ReadFrom(panicReader{})
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if err != nil {
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t.Fatal(err)
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}
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if i != 0 {
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t.Fatalf("unexpected return from bytes.ReadFrom (1): got: %d, want %d", i, 0)
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}
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check(t, "TestReadFromPanicReader (1)", &buf, "")
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// Confirm that when Reader panics, the empty buffer remains empty
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var buf2 Buffer
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defer func() {
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recover()
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check(t, "TestReadFromPanicReader (2)", &buf2, "")
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}()
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buf2.ReadFrom(panicReader{panic: true})
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}
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func TestReadFromNegativeReader(t *testing.T) {
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var b Buffer
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defer func() {
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switch err := recover().(type) {
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case nil:
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t.Fatal("bytes.Buffer.ReadFrom didn't panic")
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case error:
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// this is the error string of errNegativeRead
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wantError := "bytes.Buffer: reader returned negative count from Read"
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if err.Error() != wantError {
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t.Fatalf("recovered panic: got %v, want %v", err.Error(), wantError)
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}
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default:
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t.Fatalf("unexpected panic value: %#v", err)
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}
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}()
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b.ReadFrom(new(negativeReader))
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}
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func TestWriteTo(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, "TestWriteTo (1)", &buf, "", 5, testBytes[0:len(testBytes)/i])
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var b Buffer
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buf.WriteTo(&b)
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empty(t, "TestWriteTo (2)", &b, s, make([]byte, len(testString)))
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}
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}
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func TestRuneIO(t *testing.T) {
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const NRune = 1000
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// Built a test slice while we write the data
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b := make([]byte, utf8.UTFMax*NRune)
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var buf Buffer
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n := 0
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for r := rune(0); r < NRune; r++ {
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size := utf8.EncodeRune(b[n:], r)
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nbytes, err := buf.WriteRune(r)
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if err != nil {
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t.Fatalf("WriteRune(%U) error: %s", r, err)
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}
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if nbytes != size {
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t.Fatalf("WriteRune(%U) expected %d, got %d", r, size, nbytes)
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}
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n += size
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}
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b = b[0:n]
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// Check the resulting bytes
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if !Equal(buf.Bytes(), b) {
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t.Fatalf("incorrect result from WriteRune: %q not %q", buf.Bytes(), b)
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}
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p := make([]byte, utf8.UTFMax)
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// Read it back with ReadRune
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for r := rune(0); r < NRune; r++ {
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size := utf8.EncodeRune(p, r)
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nr, nbytes, err := buf.ReadRune()
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if nr != r || nbytes != size || err != nil {
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t.Fatalf("ReadRune(%U) got %U,%d not %U,%d (err=%s)", r, nr, nbytes, r, size, err)
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}
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}
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// Check that UnreadRune works
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buf.Reset()
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// check at EOF
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if err := buf.UnreadRune(); err == nil {
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t.Fatal("UnreadRune at EOF: got no error")
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}
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if _, _, err := buf.ReadRune(); err == nil {
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t.Fatal("ReadRune at EOF: got no error")
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}
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if err := buf.UnreadRune(); err == nil {
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t.Fatal("UnreadRune after ReadRune at EOF: got no error")
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}
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// check not at EOF
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buf.Write(b)
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for r := rune(0); r < NRune; r++ {
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r1, size, _ := buf.ReadRune()
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if err := buf.UnreadRune(); err != nil {
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t.Fatalf("UnreadRune(%U) got error %q", r, err)
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}
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r2, nbytes, err := buf.ReadRune()
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if r1 != r2 || r1 != r || nbytes != size || err != nil {
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t.Fatalf("ReadRune(%U) after UnreadRune got %U,%d not %U,%d (err=%s)", r, r2, nbytes, r, size, err)
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}
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}
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}
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func TestNext(t *testing.T) {
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b := []byte{0, 1, 2, 3, 4}
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tmp := make([]byte, 5)
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for i := 0; i <= 5; i++ {
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for j := i; j <= 5; j++ {
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for k := 0; k <= 6; k++ {
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// 0 <= i <= j <= 5; 0 <= k <= 6
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// Check that if we start with a buffer
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// of length j at offset i and ask for
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// Next(k), we get the right bytes.
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buf := NewBuffer(b[0:j])
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n, _ := buf.Read(tmp[0:i])
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if n != i {
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t.Fatalf("Read %d returned %d", i, n)
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}
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bb := buf.Next(k)
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want := k
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if want > j-i {
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want = j - i
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}
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if len(bb) != want {
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t.Fatalf("in %d,%d: len(Next(%d)) == %d", i, j, k, len(bb))
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}
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for l, v := range bb {
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if v != byte(l+i) {
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t.Fatalf("in %d,%d: Next(%d)[%d] = %d, want %d", i, j, k, l, v, l+i)
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}
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}
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}
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}
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}
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}
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var readBytesTests = []struct {
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buffer string
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delim byte
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expected []string
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err error
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}{
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{"", 0, []string{""}, io.EOF},
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{"a\x00", 0, []string{"a\x00"}, nil},
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{"abbbaaaba", 'b', []string{"ab", "b", "b", "aaab"}, nil},
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{"hello\x01world", 1, []string{"hello\x01"}, nil},
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{"foo\nbar", 0, []string{"foo\nbar"}, io.EOF},
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{"alpha\nbeta\ngamma\n", '\n', []string{"alpha\n", "beta\n", "gamma\n"}, nil},
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{"alpha\nbeta\ngamma", '\n', []string{"alpha\n", "beta\n", "gamma"}, io.EOF},
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}
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func TestReadBytes(t *testing.T) {
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for _, test := range readBytesTests {
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buf := NewBufferString(test.buffer)
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var err error
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for _, expected := range test.expected {
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var bytes []byte
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bytes, err = buf.ReadBytes(test.delim)
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if string(bytes) != expected {
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t.Errorf("expected %q, got %q", expected, bytes)
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}
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if err != nil {
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break
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}
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}
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if err != test.err {
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t.Errorf("expected error %v, got %v", test.err, err)
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}
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}
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}
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func TestReadString(t *testing.T) {
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for _, test := range readBytesTests {
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buf := NewBufferString(test.buffer)
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var err error
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for _, expected := range test.expected {
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var s string
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s, err = buf.ReadString(test.delim)
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if s != expected {
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t.Errorf("expected %q, got %q", expected, s)
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}
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if err != nil {
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break
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}
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}
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if err != test.err {
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t.Errorf("expected error %v, got %v", test.err, err)
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}
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}
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}
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func BenchmarkReadString(b *testing.B) {
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const n = 32 << 10
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data := make([]byte, n)
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data[n-1] = 'x'
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b.SetBytes(int64(n))
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for i := 0; i < b.N; i++ {
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buf := NewBuffer(data)
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_, err := buf.ReadString('x')
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if err != nil {
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b.Fatal(err)
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}
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}
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}
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|
|
func TestGrow(t *testing.T) {
|
|
x := []byte{'x'}
|
|
y := []byte{'y'}
|
|
tmp := make([]byte, 72)
|
|
for _, startLen := range []int{0, 100, 1000, 10000, 100000} {
|
|
xBytes := Repeat(x, startLen)
|
|
for _, growLen := range []int{0, 100, 1000, 10000, 100000} {
|
|
buf := NewBuffer(xBytes)
|
|
// If we read, this affects buf.off, which is good to test.
|
|
readBytes, _ := buf.Read(tmp)
|
|
buf.Grow(growLen)
|
|
yBytes := Repeat(y, growLen)
|
|
// Check no allocation occurs in write, as long as we're single-threaded.
|
|
var m1, m2 runtime.MemStats
|
|
runtime.ReadMemStats(&m1)
|
|
buf.Write(yBytes)
|
|
runtime.ReadMemStats(&m2)
|
|
if runtime.GOMAXPROCS(-1) == 1 && m1.Mallocs != m2.Mallocs {
|
|
t.Errorf("allocation occurred during write")
|
|
}
|
|
// Check that buffer has correct data.
|
|
if !Equal(buf.Bytes()[0:startLen-readBytes], xBytes[readBytes:]) {
|
|
t.Errorf("bad initial data at %d %d", startLen, growLen)
|
|
}
|
|
if !Equal(buf.Bytes()[startLen-readBytes:startLen-readBytes+growLen], yBytes) {
|
|
t.Errorf("bad written data at %d %d", startLen, growLen)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestGrowOverflow(t *testing.T) {
|
|
defer func() {
|
|
if err := recover(); err != ErrTooLarge {
|
|
t.Errorf("after too-large Grow, recover() = %v; want %v", err, ErrTooLarge)
|
|
}
|
|
}()
|
|
|
|
buf := NewBuffer(make([]byte, 1))
|
|
const maxInt = int(^uint(0) >> 1)
|
|
buf.Grow(maxInt)
|
|
}
|
|
|
|
// 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)
|
|
}
|
|
}
|
|
|
|
func TestUnreadByte(t *testing.T) {
|
|
b := new(Buffer)
|
|
|
|
// check at EOF
|
|
if err := b.UnreadByte(); err == nil {
|
|
t.Fatal("UnreadByte at EOF: got no error")
|
|
}
|
|
if _, err := b.ReadByte(); err == nil {
|
|
t.Fatal("ReadByte at EOF: got no error")
|
|
}
|
|
if err := b.UnreadByte(); err == nil {
|
|
t.Fatal("UnreadByte after ReadByte at EOF: got no error")
|
|
}
|
|
|
|
// check not at EOF
|
|
b.WriteString("abcdefghijklmnopqrstuvwxyz")
|
|
|
|
// after unsuccessful read
|
|
if n, err := b.Read(nil); n != 0 || err != nil {
|
|
t.Fatalf("Read(nil) = %d,%v; want 0,nil", n, err)
|
|
}
|
|
if err := b.UnreadByte(); err == nil {
|
|
t.Fatal("UnreadByte after Read(nil): got no error")
|
|
}
|
|
|
|
// after successful read
|
|
if _, err := b.ReadBytes('m'); err != nil {
|
|
t.Fatalf("ReadBytes: %v", err)
|
|
}
|
|
if err := b.UnreadByte(); err != nil {
|
|
t.Fatalf("UnreadByte: %v", err)
|
|
}
|
|
c, err := b.ReadByte()
|
|
if err != nil {
|
|
t.Fatalf("ReadByte: %v", err)
|
|
}
|
|
if c != 'm' {
|
|
t.Errorf("ReadByte = %q; want %q", c, 'm')
|
|
}
|
|
}
|
|
|
|
// Tests that we occasionally compact. Issue 5154.
|
|
func TestBufferGrowth(t *testing.T) {
|
|
var b Buffer
|
|
buf := make([]byte, 1024)
|
|
b.Write(buf[0:1])
|
|
var cap0 int
|
|
for i := 0; i < 5<<10; i++ {
|
|
b.Write(buf)
|
|
b.Read(buf)
|
|
if i == 0 {
|
|
cap0 = b.Cap()
|
|
}
|
|
}
|
|
cap1 := b.Cap()
|
|
// (*Buffer).grow allows for 2x capacity slop before sliding,
|
|
// so set our error threshold at 3x.
|
|
if cap1 > cap0*3 {
|
|
t.Errorf("buffer cap = %d; too big (grew from %d)", cap1, cap0)
|
|
}
|
|
}
|
|
|
|
func BenchmarkWriteByte(b *testing.B) {
|
|
const n = 4 << 10
|
|
b.SetBytes(n)
|
|
buf := NewBuffer(make([]byte, n))
|
|
for i := 0; i < b.N; i++ {
|
|
buf.Reset()
|
|
for i := 0; i < n; i++ {
|
|
buf.WriteByte('x')
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkWriteRune(b *testing.B) {
|
|
const n = 4 << 10
|
|
const r = '☺'
|
|
b.SetBytes(int64(n * utf8.RuneLen(r)))
|
|
buf := NewBuffer(make([]byte, n*utf8.UTFMax))
|
|
for i := 0; i < b.N; i++ {
|
|
buf.Reset()
|
|
for i := 0; i < n; i++ {
|
|
buf.WriteRune(r)
|
|
}
|
|
}
|
|
}
|
|
|
|
// From Issue 5154.
|
|
func BenchmarkBufferNotEmptyWriteRead(b *testing.B) {
|
|
buf := make([]byte, 1024)
|
|
for i := 0; i < b.N; i++ {
|
|
var b Buffer
|
|
b.Write(buf[0:1])
|
|
for i := 0; i < 5<<10; i++ {
|
|
b.Write(buf)
|
|
b.Read(buf)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check that we don't compact too often. From Issue 5154.
|
|
func BenchmarkBufferFullSmallReads(b *testing.B) {
|
|
buf := make([]byte, 1024)
|
|
for i := 0; i < b.N; i++ {
|
|
var b Buffer
|
|
b.Write(buf)
|
|
for b.Len()+20 < b.Cap() {
|
|
b.Write(buf[:10])
|
|
}
|
|
for i := 0; i < 5<<10; i++ {
|
|
b.Read(buf[:1])
|
|
b.Write(buf[:1])
|
|
}
|
|
}
|
|
}
|