mirror of
https://github.com/autc04/Retro68.git
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424 lines
9.1 KiB
Go
424 lines
9.1 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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"fmt"
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. "io"
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"sort"
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"strings"
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"testing"
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"time"
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)
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func checkWrite(t *testing.T, w Writer, data []byte, c chan int) {
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n, err := w.Write(data)
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if err != nil {
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t.Errorf("write: %v", err)
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}
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if n != len(data) {
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t.Errorf("short write: %d != %d", n, len(data))
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}
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c <- 0
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}
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// Test a single read/write pair.
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func TestPipe1(t *testing.T) {
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c := make(chan int)
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r, w := Pipe()
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var buf = make([]byte, 64)
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go checkWrite(t, w, []byte("hello, world"), c)
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n, err := r.Read(buf)
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if err != nil {
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t.Errorf("read: %v", err)
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} else if n != 12 || string(buf[0:12]) != "hello, world" {
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t.Errorf("bad read: got %q", buf[0:n])
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}
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<-c
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r.Close()
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w.Close()
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}
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func reader(t *testing.T, r Reader, c chan int) {
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var buf = make([]byte, 64)
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for {
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n, err := r.Read(buf)
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if err == EOF {
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c <- 0
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break
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}
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if err != nil {
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t.Errorf("read: %v", err)
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}
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c <- n
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}
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}
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// Test a sequence of read/write pairs.
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func TestPipe2(t *testing.T) {
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c := make(chan int)
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r, w := Pipe()
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go reader(t, r, c)
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var buf = make([]byte, 64)
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for i := 0; i < 5; i++ {
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p := buf[0 : 5+i*10]
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n, err := w.Write(p)
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if n != len(p) {
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t.Errorf("wrote %d, got %d", len(p), n)
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}
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if err != nil {
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t.Errorf("write: %v", err)
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}
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nn := <-c
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if nn != n {
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t.Errorf("wrote %d, read got %d", n, nn)
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}
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}
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w.Close()
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nn := <-c
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if nn != 0 {
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t.Errorf("final read got %d", nn)
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}
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}
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type pipeReturn struct {
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n int
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err error
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}
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// Test a large write that requires multiple reads to satisfy.
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func writer(w WriteCloser, buf []byte, c chan pipeReturn) {
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n, err := w.Write(buf)
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w.Close()
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c <- pipeReturn{n, err}
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}
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func TestPipe3(t *testing.T) {
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c := make(chan pipeReturn)
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r, w := Pipe()
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var wdat = make([]byte, 128)
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for i := 0; i < len(wdat); i++ {
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wdat[i] = byte(i)
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}
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go writer(w, wdat, c)
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var rdat = make([]byte, 1024)
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tot := 0
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for n := 1; n <= 256; n *= 2 {
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nn, err := r.Read(rdat[tot : tot+n])
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if err != nil && err != EOF {
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t.Fatalf("read: %v", err)
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}
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// only final two reads should be short - 1 byte, then 0
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expect := n
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if n == 128 {
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expect = 1
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} else if n == 256 {
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expect = 0
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if err != EOF {
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t.Fatalf("read at end: %v", err)
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}
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}
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if nn != expect {
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t.Fatalf("read %d, expected %d, got %d", n, expect, nn)
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}
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tot += nn
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}
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pr := <-c
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if pr.n != 128 || pr.err != nil {
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t.Fatalf("write 128: %d, %v", pr.n, pr.err)
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}
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if tot != 128 {
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t.Fatalf("total read %d != 128", tot)
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}
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for i := 0; i < 128; i++ {
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if rdat[i] != byte(i) {
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t.Fatalf("rdat[%d] = %d", i, rdat[i])
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}
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}
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}
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// Test read after/before writer close.
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type closer interface {
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CloseWithError(error) error
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Close() error
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}
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type pipeTest struct {
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async bool
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err error
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closeWithError bool
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}
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func (p pipeTest) String() string {
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return fmt.Sprintf("async=%v err=%v closeWithError=%v", p.async, p.err, p.closeWithError)
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}
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var pipeTests = []pipeTest{
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{true, nil, false},
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{true, nil, true},
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{true, ErrShortWrite, true},
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{false, nil, false},
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{false, nil, true},
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{false, ErrShortWrite, true},
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}
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func delayClose(t *testing.T, cl closer, ch chan int, tt pipeTest) {
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time.Sleep(1 * time.Millisecond)
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var err error
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if tt.closeWithError {
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err = cl.CloseWithError(tt.err)
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} else {
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err = cl.Close()
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}
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if err != nil {
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t.Errorf("delayClose: %v", err)
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}
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ch <- 0
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}
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func TestPipeReadClose(t *testing.T) {
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for _, tt := range pipeTests {
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c := make(chan int, 1)
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r, w := Pipe()
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if tt.async {
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go delayClose(t, w, c, tt)
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} else {
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delayClose(t, w, c, tt)
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}
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var buf = make([]byte, 64)
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n, err := r.Read(buf)
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<-c
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want := tt.err
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if want == nil {
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want = EOF
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}
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if err != want {
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t.Errorf("read from closed pipe: %v want %v", err, want)
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}
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if n != 0 {
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t.Errorf("read on closed pipe returned %d", n)
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}
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if err = r.Close(); err != nil {
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t.Errorf("r.Close: %v", err)
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}
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}
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}
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// Test close on Read side during Read.
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func TestPipeReadClose2(t *testing.T) {
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c := make(chan int, 1)
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r, _ := Pipe()
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go delayClose(t, r, c, pipeTest{})
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n, err := r.Read(make([]byte, 64))
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<-c
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if n != 0 || err != ErrClosedPipe {
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t.Errorf("read from closed pipe: %v, %v want %v, %v", n, err, 0, ErrClosedPipe)
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}
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}
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// Test write after/before reader close.
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func TestPipeWriteClose(t *testing.T) {
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for _, tt := range pipeTests {
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c := make(chan int, 1)
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r, w := Pipe()
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if tt.async {
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go delayClose(t, r, c, tt)
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} else {
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delayClose(t, r, c, tt)
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}
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n, err := WriteString(w, "hello, world")
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<-c
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expect := tt.err
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if expect == nil {
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expect = ErrClosedPipe
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}
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if err != expect {
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t.Errorf("write on closed pipe: %v want %v", err, expect)
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}
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if n != 0 {
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t.Errorf("write on closed pipe returned %d", n)
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}
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if err = w.Close(); err != nil {
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t.Errorf("w.Close: %v", err)
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}
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}
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}
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// Test close on Write side during Write.
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func TestPipeWriteClose2(t *testing.T) {
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c := make(chan int, 1)
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_, w := Pipe()
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go delayClose(t, w, c, pipeTest{})
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n, err := w.Write(make([]byte, 64))
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<-c
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if n != 0 || err != ErrClosedPipe {
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t.Errorf("write to closed pipe: %v, %v want %v, %v", n, err, 0, ErrClosedPipe)
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}
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}
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func TestWriteEmpty(t *testing.T) {
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r, w := Pipe()
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go func() {
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w.Write([]byte{})
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w.Close()
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}()
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var b [2]byte
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ReadFull(r, b[0:2])
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r.Close()
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}
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func TestWriteNil(t *testing.T) {
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r, w := Pipe()
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go func() {
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w.Write(nil)
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w.Close()
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}()
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var b [2]byte
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ReadFull(r, b[0:2])
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r.Close()
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}
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func TestWriteAfterWriterClose(t *testing.T) {
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r, w := Pipe()
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done := make(chan bool)
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var writeErr error
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go func() {
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_, err := w.Write([]byte("hello"))
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if err != nil {
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t.Errorf("got error: %q; expected none", err)
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}
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w.Close()
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_, writeErr = w.Write([]byte("world"))
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done <- true
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}()
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buf := make([]byte, 100)
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var result string
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n, err := ReadFull(r, buf)
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if err != nil && err != ErrUnexpectedEOF {
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t.Fatalf("got: %q; want: %q", err, ErrUnexpectedEOF)
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}
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result = string(buf[0:n])
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<-done
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if result != "hello" {
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t.Errorf("got: %q; want: %q", result, "hello")
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}
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if writeErr != ErrClosedPipe {
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t.Errorf("got: %q; want: %q", writeErr, ErrClosedPipe)
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}
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}
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func TestPipeCloseError(t *testing.T) {
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type testError1 struct{ error }
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type testError2 struct{ error }
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r, w := Pipe()
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r.CloseWithError(testError1{})
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if _, err := w.Write(nil); err != (testError1{}) {
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t.Errorf("Write error: got %T, want testError1", err)
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}
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r.CloseWithError(testError2{})
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if _, err := w.Write(nil); err != (testError2{}) {
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t.Errorf("Write error: got %T, want testError2", err)
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}
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r, w = Pipe()
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w.CloseWithError(testError1{})
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if _, err := r.Read(nil); err != (testError1{}) {
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t.Errorf("Read error: got %T, want testError1", err)
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}
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w.CloseWithError(testError2{})
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if _, err := r.Read(nil); err != (testError2{}) {
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t.Errorf("Read error: got %T, want testError2", err)
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}
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}
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func TestPipeConcurrent(t *testing.T) {
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const (
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input = "0123456789abcdef"
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count = 8
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readSize = 2
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)
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t.Run("Write", func(t *testing.T) {
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r, w := Pipe()
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for i := 0; i < count; i++ {
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go func() {
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time.Sleep(time.Millisecond) // Increase probability of race
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if n, err := w.Write([]byte(input)); n != len(input) || err != nil {
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t.Errorf("Write() = (%d, %v); want (%d, nil)", n, err, len(input))
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}
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}()
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}
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buf := make([]byte, count*len(input))
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for i := 0; i < len(buf); i += readSize {
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if n, err := r.Read(buf[i : i+readSize]); n != readSize || err != nil {
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t.Errorf("Read() = (%d, %v); want (%d, nil)", n, err, readSize)
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}
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}
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// Since each Write is fully gated, if multiple Read calls were needed,
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// the contents of Write should still appear together in the output.
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got := string(buf)
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want := strings.Repeat(input, count)
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if got != want {
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t.Errorf("got: %q; want: %q", got, want)
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}
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})
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t.Run("Read", func(t *testing.T) {
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r, w := Pipe()
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c := make(chan []byte, count*len(input)/readSize)
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for i := 0; i < cap(c); i++ {
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go func() {
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time.Sleep(time.Millisecond) // Increase probability of race
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buf := make([]byte, readSize)
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if n, err := r.Read(buf); n != readSize || err != nil {
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t.Errorf("Read() = (%d, %v); want (%d, nil)", n, err, readSize)
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}
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c <- buf
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}()
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}
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for i := 0; i < count; i++ {
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if n, err := w.Write([]byte(input)); n != len(input) || err != nil {
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t.Errorf("Write() = (%d, %v); want (%d, nil)", n, err, len(input))
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}
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}
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// Since each read is independent, the only guarantee about the output
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// is that it is a permutation of the input in readSized groups.
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got := make([]byte, 0, count*len(input))
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for i := 0; i < cap(c); i++ {
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got = append(got, (<-c)...)
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}
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got = sortBytesInGroups(got, readSize)
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want := bytes.Repeat([]byte(input), count)
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want = sortBytesInGroups(want, readSize)
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if string(got) != string(want) {
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t.Errorf("got: %q; want: %q", got, want)
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}
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})
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}
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func sortBytesInGroups(b []byte, n int) []byte {
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var groups [][]byte
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for len(b) > 0 {
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groups = append(groups, b[:n])
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b = b[n:]
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}
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sort.Slice(groups, func(i, j int) bool { return bytes.Compare(groups[i], groups[j]) < 0 })
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return bytes.Join(groups, nil)
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}
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