go clone_test 源码
golang clone_test 代码
文件路径：/src/strings/clone_test.go
// Copyright 2021 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.ß
package strings_test
import (
"reflect"
"strings"
"testing"
"unsafe"
)
var emptyString string
func TestClone(t *testing.T) {
var cloneTests = []string{
"",
strings.Clone(""),
strings.Repeat("a", 42)[:0],
"short",
strings.Repeat("a", 42),
}
for _, input := range cloneTests {
clone := strings.Clone(input)
if clone != input {
t.Errorf("Clone(%q) = %q; want %q", input, clone, input)
}
inputHeader := (*reflect.StringHeader)(unsafe.Pointer(&input))
cloneHeader := (*reflect.StringHeader)(unsafe.Pointer(&clone))
if len(input) != 0 && cloneHeader.Data == inputHeader.Data {
t.Errorf("Clone(%q) return value should not reference inputs backing memory.", input)
}
emptyHeader := (*reflect.StringHeader)(unsafe.Pointer(&emptyString))
if len(input) == 0 && cloneHeader.Data != emptyHeader.Data {
t.Errorf("Clone(%#v) return value should be equal to empty string.", inputHeader)
}
}
}
func BenchmarkClone(b *testing.B) {
var str = strings.Repeat("a", 42)
b.ReportAllocs()
for i := 0; i < b.N; i++ {
stringSink = strings.Clone(str)
}
}
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