1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// Copyright 2010 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 (
. "io"
"bytes"
"crypto/sha1"
"fmt"
"strings"
"testing"
)
func TestMultiReader(t *testing.T) {
var mr Reader
var buf []byte
nread := 0
withFooBar := func(tests func()) {
r1 := strings.NewReader("foo ")
r2 := strings.NewReader("")
r3 := strings.NewReader("bar")
mr = MultiReader(r1, r2, r3)
buf = make([]byte, 20)
tests()
}
expectRead := func(size int, expected string, eerr error) {
nread++
n, gerr := mr.Read(buf[0:size])
if n != len(expected) {
t.Errorf("#%d, expected %d bytes; got %d",
nread, len(expected), n)
}
got := string(buf[0:n])
if got != expected {
t.Errorf("#%d, expected %q; got %q",
nread, expected, got)
}
if gerr != eerr {
t.Errorf("#%d, expected error %v; got %v",
nread, eerr, gerr)
}
buf = buf[n:]
}
withFooBar(func() {
expectRead(2, "fo", nil)
expectRead(5, "o ", nil)
expectRead(5, "bar", nil)
expectRead(5, "", EOF)
})
withFooBar(func() {
expectRead(4, "foo ", nil)
expectRead(1, "b", nil)
expectRead(3, "ar", nil)
expectRead(1, "", EOF)
})
withFooBar(func() {
expectRead(5, "foo ", nil)
})
}
func TestMultiWriter(t *testing.T) {
sha1 := sha1.New()
sink := new(bytes.Buffer)
mw := MultiWriter(sha1, sink)
sourceString := "My input text."
source := strings.NewReader(sourceString)
written, err := Copy(mw, source)
if written != int64(len(sourceString)) {
t.Errorf("short write of %d, not %d", written, len(sourceString))
}
if err != nil {
t.Errorf("unexpected error: %v", err)
}
sha1hex := fmt.Sprintf("%x", sha1.Sum())
if sha1hex != "01cb303fa8c30a64123067c5aa6284ba7ec2d31b" {
t.Error("incorrect sha1 value")
}
if sink.String() != sourceString {
t.Errorf("expected %q; got %q", sourceString, sink.String())
}
}
|
