8dc2499aa6
gotools/ * Makefile.am (go_cmd_cgo_files): Add ast_go118.go (check-go-tool): Copy golang.org/x/tools directories. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695
49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.ß
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package strings_test
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import (
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"reflect"
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"strings"
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"testing"
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"unsafe"
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)
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var emptyString string
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func TestClone(t *testing.T) {
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var cloneTests = []string{
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"",
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strings.Clone(""),
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strings.Repeat("a", 42)[:0],
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"short",
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strings.Repeat("a", 42),
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}
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for _, input := range cloneTests {
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clone := strings.Clone(input)
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if clone != input {
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t.Errorf("Clone(%q) = %q; want %q", input, clone, input)
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}
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inputHeader := (*reflect.StringHeader)(unsafe.Pointer(&input))
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cloneHeader := (*reflect.StringHeader)(unsafe.Pointer(&clone))
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if len(input) != 0 && cloneHeader.Data == inputHeader.Data {
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t.Errorf("Clone(%q) return value should not reference inputs backing memory.", input)
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}
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emptyHeader := (*reflect.StringHeader)(unsafe.Pointer(&emptyString))
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if len(input) == 0 && cloneHeader.Data != emptyHeader.Data {
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t.Errorf("Clone(%#v) return value should be equal to empty string.", inputHeader)
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}
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}
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}
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func BenchmarkClone(b *testing.B) {
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var str = strings.Repeat("a", 42)
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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stringSink = strings.Clone(str)
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}
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}
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