4f4a855d82
Reviewed-on: https://go-review.googlesource.com/c/158019 gotools/: * Makefile.am (go_cmd_vet_files): Update for Go1.12beta2 release. (GOTOOLS_TEST_TIMEOUT): Increase to 600. (check-runtime): Export LD_LIBRARY_PATH before computing GOARCH and GOOS. (check-vet): Copy golang.org/x/tools into check-vet-dir. * Makefile.in: Regenerate. gcc/testsuite/: * go.go-torture/execute/names-1.go: Stop using debug/xcoff, which is no longer externally visible. From-SVN: r268084
235 lines
5.9 KiB
Go
235 lines
5.9 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 strings_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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"strings"
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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 := strings.NewReader("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: "strings.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 := strings.NewReader("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 := strings.NewReader("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, "", "strings.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 := strings.NewReader("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 := strings.NewReader("")
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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 TestWriteTo(t *testing.T) {
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const str = "0123456789"
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for i := 0; i <= len(str); i++ {
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s := str[i:]
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r := strings.NewReader(s)
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var b bytes.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", len(s), 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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// 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 := strings.NewReader("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 := strings.NewReader("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(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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func TestReaderZero(t *testing.T) {
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if l := (&strings.Reader{}).Len(); l != 0 {
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t.Errorf("Len: got %d, want 0", l)
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}
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if n, err := (&strings.Reader{}).Read(nil); n != 0 || err != io.EOF {
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t.Errorf("Read: got %d, %v; want 0, io.EOF", n, err)
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}
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if n, err := (&strings.Reader{}).ReadAt(nil, 11); n != 0 || err != io.EOF {
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t.Errorf("ReadAt: got %d, %v; want 0, io.EOF", n, err)
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}
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if b, err := (&strings.Reader{}).ReadByte(); b != 0 || err != io.EOF {
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t.Errorf("ReadByte: got %d, %v; want 0, io.EOF", b, err)
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}
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if ch, size, err := (&strings.Reader{}).ReadRune(); ch != 0 || size != 0 || err != io.EOF {
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t.Errorf("ReadRune: got %d, %d, %v; want 0, 0, io.EOF", ch, size, err)
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}
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if offset, err := (&strings.Reader{}).Seek(11, io.SeekStart); offset != 11 || err != nil {
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t.Errorf("Seek: got %d, %v; want 11, nil", offset, err)
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}
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if s := (&strings.Reader{}).Size(); s != 0 {
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t.Errorf("Size: got %d, want 0", s)
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}
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if (&strings.Reader{}).UnreadByte() == nil {
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t.Errorf("UnreadByte: got nil, want error")
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}
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if (&strings.Reader{}).UnreadRune() == nil {
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t.Errorf("UnreadRune: got nil, want error")
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}
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if n, err := (&strings.Reader{}).WriteTo(ioutil.Discard); n != 0 || err != nil {
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t.Errorf("WriteTo: got %d, %v; want 0, nil", n, err)
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}
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}
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