go internal_test 源码
golang internal_test 代码
文件路径：/src/os/exec/internal_test.go
// Copyright 2015 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 exec
import (
"io"
"testing"
)
func TestPrefixSuffixSaver(t *testing.T) {
tests := []struct {
N int
writes []string
want string
}{
{
N: 2,
writes: nil,
want: "",
},
{
N: 2,
writes: []string{"a"},
want: "a",
},
{
N: 2,
writes: []string{"abc", "d"},
want: "abcd",
},
{
N: 2,
writes: []string{"abc", "d", "e"},
want: "ab\n... omitting 1 bytes ...\nde",
},
{
N: 2,
writes: []string{"ab______________________yz"},
want: "ab\n... omitting 22 bytes ...\nyz",
},
{
N: 2,
writes: []string{"ab_______________________y", "z"},
want: "ab\n... omitting 23 bytes ...\nyz",
},
}
for i, tt := range tests {
w := &prefixSuffixSaver{N: tt.N}
for _, s := range tt.writes {
n, err := io.WriteString(w, s)
if err != nil || n != len(s) {
t.Errorf("%d. WriteString(%q) = %v, %v; want %v, %v", i, s, n, err, len(s), nil)
}
}
if got := string(w.Bytes()); got != tt.want {
t.Errorf("%d. Bytes = %q; want %q", i, got, tt.want)
}
}
}
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