github.com/michael-k/docker@v1.7.0-rc2/pkg/stdcopy/stdcopy_test.go (about)

     1  package stdcopy
     2  
     3  import (
     4  	"bytes"
     5  	"io/ioutil"
     6  	"strings"
     7  	"testing"
     8  )
     9  
    10  func TestNewStdWriter(t *testing.T) {
    11  	writer := NewStdWriter(ioutil.Discard, Stdout)
    12  	if writer == nil {
    13  		t.Fatalf("NewStdWriter with an invalid StdType should not return nil.")
    14  	}
    15  }
    16  
    17  func TestWriteWithUnitializedStdWriter(t *testing.T) {
    18  	writer := StdWriter{
    19  		Writer:  nil,
    20  		prefix:  Stdout,
    21  		sizeBuf: make([]byte, 4),
    22  	}
    23  	n, err := writer.Write([]byte("Something here"))
    24  	if n != 0 || err == nil {
    25  		t.Fatalf("Should fail when given an uncomplete or uninitialized StdWriter")
    26  	}
    27  }
    28  
    29  func TestWriteWithNilBytes(t *testing.T) {
    30  	writer := NewStdWriter(ioutil.Discard, Stdout)
    31  	n, err := writer.Write(nil)
    32  	if err != nil {
    33  		t.Fatalf("Shouldn't have fail when given no data")
    34  	}
    35  	if n > 0 {
    36  		t.Fatalf("Write should have written 0 byte, but has written %d", n)
    37  	}
    38  }
    39  
    40  func TestWrite(t *testing.T) {
    41  	writer := NewStdWriter(ioutil.Discard, Stdout)
    42  	data := []byte("Test StdWrite.Write")
    43  	n, err := writer.Write(data)
    44  	if err != nil {
    45  		t.Fatalf("Error while writing with StdWrite")
    46  	}
    47  	if n != len(data) {
    48  		t.Fatalf("Write should have writen %d byte but wrote %d.", len(data), n)
    49  	}
    50  }
    51  
    52  func TestStdCopyWithInvalidInputHeader(t *testing.T) {
    53  	dstOut := NewStdWriter(ioutil.Discard, Stdout)
    54  	dstErr := NewStdWriter(ioutil.Discard, Stderr)
    55  	src := strings.NewReader("Invalid input")
    56  	_, err := StdCopy(dstOut, dstErr, src)
    57  	if err == nil {
    58  		t.Fatal("StdCopy with invalid input header should fail.")
    59  	}
    60  }
    61  
    62  func TestStdCopyWithCorruptedPrefix(t *testing.T) {
    63  	data := []byte{0x01, 0x02, 0x03}
    64  	src := bytes.NewReader(data)
    65  	written, err := StdCopy(nil, nil, src)
    66  	if err != nil {
    67  		t.Fatalf("StdCopy should not return an error with corrupted prefix.")
    68  	}
    69  	if written != 0 {
    70  		t.Fatalf("StdCopy should have written 0, but has written %d", written)
    71  	}
    72  }
    73  
    74  func BenchmarkWrite(b *testing.B) {
    75  	w := NewStdWriter(ioutil.Discard, Stdout)
    76  	data := []byte("Test line for testing stdwriter performance\n")
    77  	data = bytes.Repeat(data, 100)
    78  	b.SetBytes(int64(len(data)))
    79  	b.ResetTimer()
    80  	for i := 0; i < b.N; i++ {
    81  		if _, err := w.Write(data); err != nil {
    82  			b.Fatal(err)
    83  		}
    84  	}
    85  }