390 lines
11 KiB
Go
390 lines
11 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 io_test
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import (
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"bytes"
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"errors"
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"fmt"
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. "io"
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"strings"
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"testing"
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)
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// An version of bytes.Buffer without ReadFrom and WriteTo
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type Buffer struct {
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bytes.Buffer
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ReaderFrom // conflicts with and hides bytes.Buffer's ReaderFrom.
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WriterTo // conflicts with and hides bytes.Buffer's WriterTo.
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}
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// Simple tests, primarily to verify the ReadFrom and WriteTo callouts inside Copy, CopyBuffer and CopyN.
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func TestCopy(t *testing.T) {
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rb := new(Buffer)
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wb := new(Buffer)
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rb.WriteString("hello, world.")
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Copy(wb, rb)
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if wb.String() != "hello, world." {
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t.Errorf("Copy did not work properly")
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}
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}
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func TestCopyBuffer(t *testing.T) {
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rb := new(Buffer)
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wb := new(Buffer)
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rb.WriteString("hello, world.")
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CopyBuffer(wb, rb, make([]byte, 1)) // Tiny buffer to keep it honest.
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if wb.String() != "hello, world." {
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t.Errorf("CopyBuffer did not work properly")
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}
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}
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func TestCopyBufferNil(t *testing.T) {
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rb := new(Buffer)
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wb := new(Buffer)
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rb.WriteString("hello, world.")
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CopyBuffer(wb, rb, nil) // Should allocate a buffer.
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if wb.String() != "hello, world." {
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t.Errorf("CopyBuffer did not work properly")
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}
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}
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func TestCopyReadFrom(t *testing.T) {
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rb := new(Buffer)
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wb := new(bytes.Buffer) // implements ReadFrom.
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rb.WriteString("hello, world.")
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Copy(wb, rb)
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if wb.String() != "hello, world." {
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t.Errorf("Copy did not work properly")
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}
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}
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func TestCopyWriteTo(t *testing.T) {
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rb := new(bytes.Buffer) // implements WriteTo.
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wb := new(Buffer)
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rb.WriteString("hello, world.")
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Copy(wb, rb)
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if wb.String() != "hello, world." {
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t.Errorf("Copy did not work properly")
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}
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}
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// Version of bytes.Buffer that checks whether WriteTo was called or not
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type writeToChecker struct {
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bytes.Buffer
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writeToCalled bool
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}
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func (wt *writeToChecker) WriteTo(w Writer) (int64, error) {
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wt.writeToCalled = true
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return wt.Buffer.WriteTo(w)
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}
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// It's preferable to choose WriterTo over ReaderFrom, since a WriterTo can issue one large write,
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// while the ReaderFrom must read until EOF, potentially allocating when running out of buffer.
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// Make sure that we choose WriterTo when both are implemented.
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func TestCopyPriority(t *testing.T) {
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rb := new(writeToChecker)
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wb := new(bytes.Buffer)
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rb.WriteString("hello, world.")
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Copy(wb, rb)
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if wb.String() != "hello, world." {
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t.Errorf("Copy did not work properly")
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} else if !rb.writeToCalled {
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t.Errorf("WriteTo was not prioritized over ReadFrom")
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}
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}
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type zeroErrReader struct {
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err error
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}
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func (r zeroErrReader) Read(p []byte) (int, error) {
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return copy(p, []byte{0}), r.err
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}
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type errWriter struct {
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err error
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}
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func (w errWriter) Write([]byte) (int, error) {
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return 0, w.err
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}
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// In case a Read results in an error with non-zero bytes read, and
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// the subsequent Write also results in an error, the error from Write
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// is returned, as it is the one that prevented progressing further.
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func TestCopyReadErrWriteErr(t *testing.T) {
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er, ew := errors.New("readError"), errors.New("writeError")
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r, w := zeroErrReader{err: er}, errWriter{err: ew}
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n, err := Copy(w, r)
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if n != 0 || err != ew {
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t.Errorf("Copy(zeroErrReader, errWriter) = %d, %v; want 0, writeError", n, err)
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}
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}
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func TestCopyN(t *testing.T) {
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rb := new(Buffer)
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wb := new(Buffer)
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rb.WriteString("hello, world.")
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CopyN(wb, rb, 5)
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if wb.String() != "hello" {
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t.Errorf("CopyN did not work properly")
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}
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}
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func TestCopyNReadFrom(t *testing.T) {
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rb := new(Buffer)
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wb := new(bytes.Buffer) // implements ReadFrom.
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rb.WriteString("hello")
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CopyN(wb, rb, 5)
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if wb.String() != "hello" {
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t.Errorf("CopyN did not work properly")
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}
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}
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func TestCopyNWriteTo(t *testing.T) {
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rb := new(bytes.Buffer) // implements WriteTo.
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wb := new(Buffer)
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rb.WriteString("hello, world.")
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CopyN(wb, rb, 5)
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if wb.String() != "hello" {
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t.Errorf("CopyN did not work properly")
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}
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}
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type noReadFrom struct {
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w Writer
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}
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func (w *noReadFrom) Write(p []byte) (n int, err error) {
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return w.w.Write(p)
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}
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type wantedAndErrReader struct{}
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func (wantedAndErrReader) Read(p []byte) (int, error) {
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return len(p), errors.New("wantedAndErrReader error")
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}
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func TestCopyNEOF(t *testing.T) {
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// Test that EOF behavior is the same regardless of whether
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// argument to CopyN has ReadFrom.
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b := new(bytes.Buffer)
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n, err := CopyN(&noReadFrom{b}, strings.NewReader("foo"), 3)
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if n != 3 || err != nil {
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t.Errorf("CopyN(noReadFrom, foo, 3) = %d, %v; want 3, nil", n, err)
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}
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n, err = CopyN(&noReadFrom{b}, strings.NewReader("foo"), 4)
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if n != 3 || err != EOF {
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t.Errorf("CopyN(noReadFrom, foo, 4) = %d, %v; want 3, EOF", n, err)
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}
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n, err = CopyN(b, strings.NewReader("foo"), 3) // b has read from
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if n != 3 || err != nil {
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t.Errorf("CopyN(bytes.Buffer, foo, 3) = %d, %v; want 3, nil", n, err)
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}
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n, err = CopyN(b, strings.NewReader("foo"), 4) // b has read from
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if n != 3 || err != EOF {
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t.Errorf("CopyN(bytes.Buffer, foo, 4) = %d, %v; want 3, EOF", n, err)
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}
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n, err = CopyN(b, wantedAndErrReader{}, 5)
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if n != 5 || err != nil {
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t.Errorf("CopyN(bytes.Buffer, wantedAndErrReader, 5) = %d, %v; want 5, nil", n, err)
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}
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n, err = CopyN(&noReadFrom{b}, wantedAndErrReader{}, 5)
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if n != 5 || err != nil {
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t.Errorf("CopyN(noReadFrom, wantedAndErrReader, 5) = %d, %v; want 5, nil", n, err)
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}
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}
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func TestReadAtLeast(t *testing.T) {
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var rb bytes.Buffer
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testReadAtLeast(t, &rb)
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}
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// A version of bytes.Buffer that returns n > 0, err on Read
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// when the input is exhausted.
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type dataAndErrorBuffer struct {
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err error
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bytes.Buffer
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}
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func (r *dataAndErrorBuffer) Read(p []byte) (n int, err error) {
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n, err = r.Buffer.Read(p)
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if n > 0 && r.Buffer.Len() == 0 && err == nil {
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err = r.err
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}
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return
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}
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func TestReadAtLeastWithDataAndEOF(t *testing.T) {
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var rb dataAndErrorBuffer
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rb.err = EOF
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testReadAtLeast(t, &rb)
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}
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func TestReadAtLeastWithDataAndError(t *testing.T) {
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var rb dataAndErrorBuffer
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rb.err = fmt.Errorf("fake error")
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testReadAtLeast(t, &rb)
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}
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func testReadAtLeast(t *testing.T, rb ReadWriter) {
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rb.Write([]byte("0123"))
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buf := make([]byte, 2)
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n, err := ReadAtLeast(rb, buf, 2)
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if err != nil {
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t.Error(err)
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}
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n, err = ReadAtLeast(rb, buf, 4)
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if err != ErrShortBuffer {
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t.Errorf("expected ErrShortBuffer got %v", err)
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}
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if n != 0 {
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t.Errorf("expected to have read 0 bytes, got %v", n)
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}
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n, err = ReadAtLeast(rb, buf, 1)
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if err != nil {
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t.Error(err)
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}
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if n != 2 {
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t.Errorf("expected to have read 2 bytes, got %v", n)
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}
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n, err = ReadAtLeast(rb, buf, 2)
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if err != EOF {
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t.Errorf("expected EOF, got %v", err)
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}
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if n != 0 {
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t.Errorf("expected to have read 0 bytes, got %v", n)
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}
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rb.Write([]byte("4"))
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n, err = ReadAtLeast(rb, buf, 2)
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want := ErrUnexpectedEOF
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if rb, ok := rb.(*dataAndErrorBuffer); ok && rb.err != EOF {
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want = rb.err
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}
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if err != want {
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t.Errorf("expected %v, got %v", want, err)
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}
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if n != 1 {
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t.Errorf("expected to have read 1 bytes, got %v", n)
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}
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}
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func TestTeeReader(t *testing.T) {
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src := []byte("hello, world")
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dst := make([]byte, len(src))
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rb := bytes.NewBuffer(src)
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wb := new(bytes.Buffer)
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r := TeeReader(rb, wb)
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if n, err := ReadFull(r, dst); err != nil || n != len(src) {
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t.Fatalf("ReadFull(r, dst) = %d, %v; want %d, nil", n, err, len(src))
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}
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if !bytes.Equal(dst, src) {
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t.Errorf("bytes read = %q want %q", dst, src)
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}
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if !bytes.Equal(wb.Bytes(), src) {
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t.Errorf("bytes written = %q want %q", wb.Bytes(), src)
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}
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if n, err := r.Read(dst); n != 0 || err != EOF {
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t.Errorf("r.Read at EOF = %d, %v want 0, EOF", n, err)
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}
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rb = bytes.NewBuffer(src)
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pr, pw := Pipe()
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pr.Close()
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r = TeeReader(rb, pw)
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if n, err := ReadFull(r, dst); n != 0 || err != ErrClosedPipe {
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t.Errorf("closed tee: ReadFull(r, dst) = %d, %v; want 0, EPIPE", n, err)
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}
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}
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func TestSectionReader_ReadAt(t *testing.T) {
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dat := "a long sample data, 1234567890"
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tests := []struct {
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data string
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off int
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n int
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bufLen int
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at int
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exp string
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err error
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}{
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{data: "", off: 0, n: 10, bufLen: 2, at: 0, exp: "", err: EOF},
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{data: dat, off: 0, n: len(dat), bufLen: 0, at: 0, exp: "", err: nil},
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{data: dat, off: len(dat), n: 1, bufLen: 1, at: 0, exp: "", err: EOF},
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{data: dat, off: 0, n: len(dat) + 2, bufLen: len(dat), at: 0, exp: dat, err: nil},
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{data: dat, off: 0, n: len(dat), bufLen: len(dat) / 2, at: 0, exp: dat[:len(dat)/2], err: nil},
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{data: dat, off: 0, n: len(dat), bufLen: len(dat), at: 0, exp: dat, err: nil},
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{data: dat, off: 0, n: len(dat), bufLen: len(dat) / 2, at: 2, exp: dat[2 : 2+len(dat)/2], err: nil},
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{data: dat, off: 3, n: len(dat), bufLen: len(dat) / 2, at: 2, exp: dat[5 : 5+len(dat)/2], err: nil},
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{data: dat, off: 3, n: len(dat) / 2, bufLen: len(dat)/2 - 2, at: 2, exp: dat[5 : 5+len(dat)/2-2], err: nil},
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{data: dat, off: 3, n: len(dat) / 2, bufLen: len(dat)/2 + 2, at: 2, exp: dat[5 : 5+len(dat)/2-2], err: EOF},
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{data: dat, off: 0, n: 0, bufLen: 0, at: -1, exp: "", err: EOF},
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{data: dat, off: 0, n: 0, bufLen: 0, at: 1, exp: "", err: EOF},
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}
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for i, tt := range tests {
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r := strings.NewReader(tt.data)
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s := NewSectionReader(r, int64(tt.off), int64(tt.n))
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buf := make([]byte, tt.bufLen)
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if n, err := s.ReadAt(buf, int64(tt.at)); n != len(tt.exp) || string(buf[:n]) != tt.exp || err != tt.err {
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t.Fatalf("%d: ReadAt(%d) = %q, %v; expected %q, %v", i, tt.at, buf[:n], err, tt.exp, tt.err)
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}
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}
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}
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func TestSectionReader_Seek(t *testing.T) {
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// Verifies that NewSectionReader's Seeker behaves like bytes.NewReader (which is like strings.NewReader)
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br := bytes.NewReader([]byte("foo"))
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sr := NewSectionReader(br, 0, int64(len("foo")))
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for _, whence := range []int{SeekStart, SeekCurrent, SeekEnd} {
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for offset := int64(-3); offset <= 4; offset++ {
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brOff, brErr := br.Seek(offset, whence)
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srOff, srErr := sr.Seek(offset, whence)
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if (brErr != nil) != (srErr != nil) || brOff != srOff {
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t.Errorf("For whence %d, offset %d: bytes.Reader.Seek = (%v, %v) != SectionReader.Seek = (%v, %v)",
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whence, offset, brOff, brErr, srErr, srOff)
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}
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}
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}
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// And verify we can just seek past the end and get an EOF
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got, err := sr.Seek(100, SeekStart)
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if err != nil || got != 100 {
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t.Errorf("Seek = %v, %v; want 100, nil", got, err)
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}
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n, err := sr.Read(make([]byte, 10))
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if n != 0 || err != EOF {
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t.Errorf("Read = %v, %v; want 0, EOF", n, err)
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}
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}
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func TestSectionReader_Size(t *testing.T) {
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tests := []struct {
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data string
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want int64
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}{
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{"a long sample data, 1234567890", 30},
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{"", 0},
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}
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for _, tt := range tests {
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r := strings.NewReader(tt.data)
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sr := NewSectionReader(r, 0, int64(len(tt.data)))
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if got := sr.Size(); got != tt.want {
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t.Errorf("Size = %v; want %v", got, tt.want)
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}
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}
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}
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