github.com/coreos/mantle@v0.13.0/network/bufnet/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  // Licensed under the same terms as Go itself:
     5  // https://github.com/golang/go/blob/master/LICENSE
     6  
     7  package bufnet
     8  
     9  import (
    10  	"bytes"
    11  	"io"
    12  	"testing"
    13  )
    14  
    15  func checkPipeWrite(t *testing.T, w io.Writer, data []byte, c chan int) {
    16  	n, err := w.Write(data)
    17  	if err != nil {
    18  		t.Error(err)
    19  	}
    20  	if n != len(data) {
    21  		t.Errorf("short write: %d != %d", n, len(data))
    22  	}
    23  	c <- 0
    24  }
    25  
    26  func checkPipeRead(t *testing.T, r io.Reader, data []byte, wantErr error) {
    27  	buf := make([]byte, len(data)+10)
    28  	n, err := r.Read(buf)
    29  	if err != wantErr {
    30  		t.Error(err)
    31  		return
    32  	}
    33  	if n != len(data) || !bytes.Equal(buf[0:n], data) {
    34  		t.Errorf("bad read: got %q", buf[0:n])
    35  		return
    36  	}
    37  }
    38  
    39  // TestPipe tests a simple read/write/close sequence.
    40  // Assumes that the underlying io.Pipe implementation
    41  // is solid and we're just testing the net wrapping.
    42  func TestPipe(t *testing.T) {
    43  	c := make(chan int)
    44  	cli, srv := Pipe()
    45  	go checkPipeWrite(t, cli, []byte("hello, world"), c)
    46  	checkPipeRead(t, srv, []byte("hello, world"), nil)
    47  	<-c
    48  	go checkPipeWrite(t, srv, []byte("line 2"), c)
    49  	checkPipeRead(t, cli, []byte("line 2"), nil)
    50  	<-c
    51  	go checkPipeWrite(t, cli, []byte("a third line"), c)
    52  	checkPipeRead(t, srv, []byte("a third line"), nil)
    53  	<-c
    54  	go srv.Close()
    55  	checkPipeRead(t, cli, nil, io.EOF)
    56  	cli.Close()
    57  }