279 lines
6.9 KiB
Go
279 lines
6.9 KiB
Go
// Copyright 2012 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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"fmt"
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"io"
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"io/ioutil"
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"sync"
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"testing"
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)
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func TestReader(t *testing.T) {
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r := NewReader([]byte("0123456789"))
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tests := []struct {
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off int64
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seek int
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n int
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want string
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wantpos int64
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readerr error
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seekerr string
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}{
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{seek: io.SeekStart, off: 0, n: 20, want: "0123456789"},
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{seek: io.SeekStart, off: 1, n: 1, want: "1"},
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{seek: io.SeekCurrent, off: 1, wantpos: 3, n: 2, want: "34"},
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{seek: io.SeekStart, off: -1, seekerr: "bytes.Reader.Seek: negative position"},
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{seek: io.SeekStart, off: 1 << 33, wantpos: 1 << 33, readerr: io.EOF},
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{seek: io.SeekCurrent, off: 1, wantpos: 1<<33 + 1, readerr: io.EOF},
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{seek: io.SeekStart, n: 5, want: "01234"},
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{seek: io.SeekCurrent, n: 5, want: "56789"},
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{seek: io.SeekEnd, off: -1, n: 1, wantpos: 9, want: "9"},
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}
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for i, tt := range tests {
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pos, err := r.Seek(tt.off, tt.seek)
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if err == nil && tt.seekerr != "" {
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t.Errorf("%d. want seek error %q", i, tt.seekerr)
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continue
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}
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if err != nil && err.Error() != tt.seekerr {
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t.Errorf("%d. seek error = %q; want %q", i, err.Error(), tt.seekerr)
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continue
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}
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if tt.wantpos != 0 && tt.wantpos != pos {
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t.Errorf("%d. pos = %d, want %d", i, pos, tt.wantpos)
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}
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buf := make([]byte, tt.n)
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n, err := r.Read(buf)
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if err != tt.readerr {
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t.Errorf("%d. read = %v; want %v", i, err, tt.readerr)
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continue
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}
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got := string(buf[:n])
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if got != tt.want {
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t.Errorf("%d. got %q; want %q", i, got, tt.want)
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}
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}
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}
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func TestReadAfterBigSeek(t *testing.T) {
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r := NewReader([]byte("0123456789"))
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if _, err := r.Seek(1<<31+5, io.SeekStart); err != nil {
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t.Fatal(err)
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}
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if n, err := r.Read(make([]byte, 10)); n != 0 || err != io.EOF {
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t.Errorf("Read = %d, %v; want 0, EOF", n, err)
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}
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}
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func TestReaderAt(t *testing.T) {
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r := NewReader([]byte("0123456789"))
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tests := []struct {
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off int64
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n int
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want string
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wanterr interface{}
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}{
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{0, 10, "0123456789", nil},
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{1, 10, "123456789", io.EOF},
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{1, 9, "123456789", nil},
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{11, 10, "", io.EOF},
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{0, 0, "", nil},
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{-1, 0, "", "bytes.Reader.ReadAt: negative offset"},
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}
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for i, tt := range tests {
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b := make([]byte, tt.n)
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rn, err := r.ReadAt(b, tt.off)
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got := string(b[:rn])
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if got != tt.want {
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t.Errorf("%d. got %q; want %q", i, got, tt.want)
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}
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if fmt.Sprintf("%v", err) != fmt.Sprintf("%v", tt.wanterr) {
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t.Errorf("%d. got error = %v; want %v", i, err, tt.wanterr)
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}
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}
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}
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func TestReaderAtConcurrent(t *testing.T) {
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// Test for the race detector, to verify ReadAt doesn't mutate
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// any state.
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r := NewReader([]byte("0123456789"))
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var wg sync.WaitGroup
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for i := 0; i < 5; i++ {
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wg.Add(1)
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go func(i int) {
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defer wg.Done()
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var buf [1]byte
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r.ReadAt(buf[:], int64(i))
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}(i)
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}
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wg.Wait()
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}
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func TestEmptyReaderConcurrent(t *testing.T) {
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// Test for the race detector, to verify a Read that doesn't yield any bytes
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// is okay to use from multiple goroutines. This was our historic behavior.
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// See golang.org/issue/7856
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r := NewReader([]byte{})
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var wg sync.WaitGroup
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for i := 0; i < 5; i++ {
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wg.Add(2)
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go func() {
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defer wg.Done()
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var buf [1]byte
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r.Read(buf[:])
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}()
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go func() {
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defer wg.Done()
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r.Read(nil)
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}()
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}
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wg.Wait()
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}
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func TestReaderWriteTo(t *testing.T) {
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for i := 0; i < 30; i += 3 {
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var l int
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if i > 0 {
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l = len(data) / i
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}
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s := data[:l]
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r := NewReader(testBytes[:l])
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var b Buffer
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n, err := r.WriteTo(&b)
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if expect := int64(len(s)); n != expect {
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t.Errorf("got %v; want %v", n, expect)
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}
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if err != nil {
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t.Errorf("for length %d: got error = %v; want nil", l, err)
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}
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if b.String() != s {
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t.Errorf("got string %q; want %q", b.String(), s)
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}
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if r.Len() != 0 {
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t.Errorf("reader contains %v bytes; want 0", r.Len())
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}
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}
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}
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func TestReaderLen(t *testing.T) {
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const data = "hello world"
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r := NewReader([]byte(data))
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if got, want := r.Len(), 11; got != want {
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t.Errorf("r.Len(): got %d, want %d", got, want)
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}
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if n, err := r.Read(make([]byte, 10)); err != nil || n != 10 {
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t.Errorf("Read failed: read %d %v", n, err)
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}
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if got, want := r.Len(), 1; got != want {
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t.Errorf("r.Len(): got %d, want %d", got, want)
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}
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if n, err := r.Read(make([]byte, 1)); err != nil || n != 1 {
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t.Errorf("Read failed: read %d %v; want 1, nil", n, err)
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}
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if got, want := r.Len(), 0; got != want {
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t.Errorf("r.Len(): got %d, want %d", got, want)
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}
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}
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var UnreadRuneErrorTests = []struct {
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name string
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f func(*Reader)
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}{
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{"Read", func(r *Reader) { r.Read([]byte{0}) }},
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{"ReadByte", func(r *Reader) { r.ReadByte() }},
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{"UnreadRune", func(r *Reader) { r.UnreadRune() }},
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{"Seek", func(r *Reader) { r.Seek(0, io.SeekCurrent) }},
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{"WriteTo", func(r *Reader) { r.WriteTo(&Buffer{}) }},
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}
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func TestUnreadRuneError(t *testing.T) {
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for _, tt := range UnreadRuneErrorTests {
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reader := NewReader([]byte("0123456789"))
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if _, _, err := reader.ReadRune(); err != nil {
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// should not happen
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t.Fatal(err)
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}
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tt.f(reader)
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err := reader.UnreadRune()
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if err == nil {
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t.Errorf("Unreading after %s: expected error", tt.name)
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}
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}
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}
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func TestReaderDoubleUnreadRune(t *testing.T) {
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buf := NewBuffer([]byte("groucho"))
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if _, _, err := buf.ReadRune(); err != nil {
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// should not happen
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t.Fatal(err)
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}
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if err := buf.UnreadByte(); err != nil {
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// should not happen
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t.Fatal(err)
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}
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if err := buf.UnreadByte(); err == nil {
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t.Fatal("UnreadByte: expected error, got nil")
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}
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}
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// verify that copying from an empty reader always has the same results,
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// regardless of the presence of a WriteTo method.
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func TestReaderCopyNothing(t *testing.T) {
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type nErr struct {
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n int64
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err error
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}
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type justReader struct {
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io.Reader
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}
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type justWriter struct {
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io.Writer
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}
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discard := justWriter{ioutil.Discard} // hide ReadFrom
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var with, withOut nErr
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with.n, with.err = io.Copy(discard, NewReader(nil))
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withOut.n, withOut.err = io.Copy(discard, justReader{NewReader(nil)})
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if with != withOut {
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t.Errorf("behavior differs: with = %#v; without: %#v", with, withOut)
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}
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}
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// tests that Len is affected by reads, but Size is not.
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func TestReaderLenSize(t *testing.T) {
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r := NewReader([]byte("abc"))
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io.CopyN(ioutil.Discard, r, 1)
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if r.Len() != 2 {
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t.Errorf("Len = %d; want 2", r.Len())
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}
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if r.Size() != 3 {
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t.Errorf("Size = %d; want 3", r.Size())
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}
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}
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func TestReaderReset(t *testing.T) {
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r := NewReader([]byte("世界"))
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if _, _, err := r.ReadRune(); err != nil {
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t.Errorf("ReadRune: unexpected error: %v", err)
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}
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const want = "abcdef"
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r.Reset([]byte(want))
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if err := r.UnreadRune(); err == nil {
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t.Errorf("UnreadRune: expected error, got nil")
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}
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buf, err := ioutil.ReadAll(r)
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if err != nil {
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t.Errorf("ReadAll: unexpected error: %v", err)
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}
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if got := string(buf); got != want {
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t.Errorf("ReadAll: got %q, want %q", got, want)
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}
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}
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