github.com/roboticscm/goman@v0.0.0-20210203095141-87c07b4a0a55/src/net/pipe_test.go (about)

     1  // Copyright 2010 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package net
     6  
     7  import (
     8  	"bytes"
     9  	"io"
    10  	"testing"
    11  )
    12  
    13  func checkWrite(t *testing.T, w io.Writer, data []byte, c chan int) {
    14  	n, err := w.Write(data)
    15  	if err != nil {
    16  		t.Errorf("write: %v", err)
    17  	}
    18  	if n != len(data) {
    19  		t.Errorf("short write: %d != %d", n, len(data))
    20  	}
    21  	c <- 0
    22  }
    23  
    24  func checkRead(t *testing.T, r io.Reader, data []byte, wantErr error) {
    25  	buf := make([]byte, len(data)+10)
    26  	n, err := r.Read(buf)
    27  	if err != wantErr {
    28  		t.Errorf("read: %v", err)
    29  		return
    30  	}
    31  	if n != len(data) || !bytes.Equal(buf[0:n], data) {
    32  		t.Errorf("bad read: got %q", buf[0:n])
    33  		return
    34  	}
    35  }
    36  
    37  // Test a simple read/write/close sequence.
    38  // Assumes that the underlying io.Pipe implementation
    39  // is solid and we're just testing the net wrapping.
    40  
    41  func TestPipe(t *testing.T) {
    42  	c := make(chan int)
    43  	cli, srv := Pipe()
    44  	go checkWrite(t, cli, []byte("hello, world"), c)
    45  	checkRead(t, srv, []byte("hello, world"), nil)
    46  	<-c
    47  	go checkWrite(t, srv, []byte("line 2"), c)
    48  	checkRead(t, cli, []byte("line 2"), nil)
    49  	<-c
    50  	go checkWrite(t, cli, []byte("a third line"), c)
    51  	checkRead(t, srv, []byte("a third line"), nil)
    52  	<-c
    53  	go srv.Close()
    54  	checkRead(t, cli, nil, io.EOF)
    55  	cli.Close()
    56  }