Subversion Repositories openrisc

// Copyright 2009 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package io_test

import (

        "bytes"

        . "io"

        "strings"

        "testing"

)

// An version of bytes.Buffer without ReadFrom and WriteTo

type Buffer struct {

        bytes.Buffer

        ReaderFrom // conflicts with and hides bytes.Buffer's ReaderFrom.

        WriterTo   // conflicts with and hides bytes.Buffer's WriterTo.

}

// Simple tests, primarily to verify the ReadFrom and WriteTo callouts inside Copy and CopyN.

func TestCopy(t *testing.T) {

        rb := new(Buffer)

        wb := new(Buffer)

        rb.WriteString("hello, world.")

        Copy(wb, rb)

        if wb.String() != "hello, world." {

                t.Errorf("Copy did not work properly")

        }

}

func TestCopyReadFrom(t *testing.T) {

        rb := new(Buffer)

        wb := new(bytes.Buffer) // implements ReadFrom.

        rb.WriteString("hello, world.")

        Copy(wb, rb)

        if wb.String() != "hello, world." {

                t.Errorf("Copy did not work properly")

        }

}

func TestCopyWriteTo(t *testing.T) {

        rb := new(bytes.Buffer) // implements WriteTo.

        wb := new(Buffer)

        rb.WriteString("hello, world.")

        Copy(wb, rb)

        if wb.String() != "hello, world." {

                t.Errorf("Copy did not work properly")

        }

}

func TestCopyN(t *testing.T) {

        rb := new(Buffer)

        wb := new(Buffer)

        rb.WriteString("hello, world.")

        CopyN(wb, rb, 5)

        if wb.String() != "hello" {

                t.Errorf("CopyN did not work properly")

        }

}

func TestCopyNReadFrom(t *testing.T) {

        rb := new(Buffer)

        wb := new(bytes.Buffer) // implements ReadFrom.

        rb.WriteString("hello")

        CopyN(wb, rb, 5)

        if wb.String() != "hello" {

                t.Errorf("CopyN did not work properly")

        }

}

func TestCopyNWriteTo(t *testing.T) {

        rb := new(bytes.Buffer) // implements WriteTo.

        wb := new(Buffer)

        rb.WriteString("hello, world.")

        CopyN(wb, rb, 5)

        if wb.String() != "hello" {

                t.Errorf("CopyN did not work properly")

        }

}

type noReadFrom struct {

        w Writer

}

func (w *noReadFrom) Write(p []byte) (n int, err error) {

        return w.w.Write(p)

}

func TestCopyNEOF(t *testing.T) {

        // Test that EOF behavior is the same regardless of whether

        // argument to CopyN has ReadFrom.

        b := new(bytes.Buffer)

        n, err := CopyN(&noReadFrom{b}, strings.NewReader("foo"), 3)

        if n != 3 || err != nil {

                t.Errorf("CopyN(noReadFrom, foo, 3) = %d, %v; want 3, nil", n, err)

        }

        n, err = CopyN(&noReadFrom{b}, strings.NewReader("foo"), 4)

        if n != 3 || err != EOF {

                t.Errorf("CopyN(noReadFrom, foo, 4) = %d, %v; want 3, EOF", n, err)

        }

        n, err = CopyN(b, strings.NewReader("foo"), 3) // b has read from

        if n != 3 || err != nil {

                t.Errorf("CopyN(bytes.Buffer, foo, 3) = %d, %v; want 3, nil", n, err)

        }

        n, err = CopyN(b, strings.NewReader("foo"), 4) // b has read from

        if n != 3 || err != EOF {

                t.Errorf("CopyN(bytes.Buffer, foo, 4) = %d, %v; want 3, EOF", n, err)

        }

}

func TestReadAtLeast(t *testing.T) {

        var rb bytes.Buffer

        testReadAtLeast(t, &rb)

}

// A version of bytes.Buffer that returns n > 0, EOF on Read

// when the input is exhausted.

type dataAndEOFBuffer struct {

        bytes.Buffer

}

func (r *dataAndEOFBuffer) Read(p []byte) (n int, err error) {

        n, err = r.Buffer.Read(p)

        if n > 0 && r.Buffer.Len() == 0 && err == nil {

                err = EOF

        }

        return

}

func TestReadAtLeastWithDataAndEOF(t *testing.T) {

        var rb dataAndEOFBuffer

        testReadAtLeast(t, &rb)

}

func testReadAtLeast(t *testing.T, rb ReadWriter) {

        rb.Write([]byte("0123"))

        buf := make([]byte, 2)

        n, err := ReadAtLeast(rb, buf, 2)

        if err != nil {

                t.Error(err)

        }

        n, err = ReadAtLeast(rb, buf, 4)

        if err != ErrShortBuffer {

                t.Errorf("expected ErrShortBuffer got %v", err)

        }

        if n != 0 {

                t.Errorf("expected to have read 0 bytes, got %v", n)

        }

        n, err = ReadAtLeast(rb, buf, 1)

        if err != nil {

                t.Error(err)

        }

        if n != 2 {

                t.Errorf("expected to have read 2 bytes, got %v", n)

        }

        n, err = ReadAtLeast(rb, buf, 2)

        if err != EOF {

                t.Errorf("expected EOF, got %v", err)

        }

        if n != 0 {

                t.Errorf("expected to have read 0 bytes, got %v", n)

        }

        rb.Write([]byte("4"))

        n, err = ReadAtLeast(rb, buf, 2)

        if err != ErrUnexpectedEOF {

                t.Errorf("expected ErrUnexpectedEOF, got %v", err)

        }

        if n != 1 {

                t.Errorf("expected to have read 1 bytes, got %v", n)

        }

}

func TestTeeReader(t *testing.T) {

        src := []byte("hello, world")

        dst := make([]byte, len(src))

        rb := bytes.NewBuffer(src)

        wb := new(bytes.Buffer)

        r := TeeReader(rb, wb)

        if n, err := ReadFull(r, dst); err != nil || n != len(src) {

                t.Fatalf("ReadFull(r, dst) = %d, %v; want %d, nil", n, err, len(src))

        }

        if !bytes.Equal(dst, src) {

                t.Errorf("bytes read = %q want %q", dst, src)

        }

        if !bytes.Equal(wb.Bytes(), src) {

                t.Errorf("bytes written = %q want %q", wb.Bytes(), src)

        }

        if n, err := r.Read(dst); n != 0 || err != EOF {

                t.Errorf("r.Read at EOF = %d, %v want 0, EOF", n, err)

        }

        rb = bytes.NewBuffer(src)

        pr, pw := Pipe()

        pr.Close()

        r = TeeReader(rb, pw)

        if n, err := ReadFull(r, dst); n != 0 || err != ErrClosedPipe {

                t.Errorf("closed tee: ReadFull(r, dst) = %d, %v; want 0, EPIPE", n, err)

        }

}