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// 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.
package strings_test
import (
"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)
}
if len(input) != 0 && unsafe.StringData(clone) == unsafe.StringData(input) {
t.Errorf("Clone(%q) return value should not reference inputs backing memory.", input)
}
if len(input) == 0 && unsafe.StringData(clone) != unsafe.StringData(emptyString) {
t.Errorf("Clone(%#v) return value should be equal to empty string.", unsafe.StringData(input))
}
}
}
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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