138 lines
3.3 KiB
Go
138 lines
3.3 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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"os"
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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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seekerr string
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}{
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{seek: os.SEEK_SET, off: 0, n: 20, want: "0123456789"},
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{seek: os.SEEK_SET, off: 1, n: 1, want: "1"},
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{seek: os.SEEK_CUR, off: 1, wantpos: 3, n: 2, want: "34"},
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{seek: os.SEEK_SET, off: -1, seekerr: "bytes: negative position"},
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{seek: os.SEEK_SET, off: 1<<31 - 1},
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{seek: os.SEEK_CUR, off: 1, seekerr: "bytes: position out of range"},
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{seek: os.SEEK_SET, n: 5, want: "01234"},
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{seek: os.SEEK_CUR, n: 5, want: "56789"},
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{seek: os.SEEK_END, 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 != nil {
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t.Errorf("%d. read = %v", i, err)
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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 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: invalid 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 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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// 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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