github.com/pgavlin/text@v0.0.0-20240419000839-8438d0a47805/clone_test.go (about) 1 // Copyright 2021 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package text_test 6 7 import ( 8 "strings" 9 "testing" 10 "unsafe" 11 ) 12 13 var emptyString string 14 15 func TestClone(t *testing.T) { 16 var cloneTests = []string{ 17 "", 18 strings.Clone(""), 19 strings.Repeat("a", 42)[:0], 20 "short", 21 strings.Repeat("a", 42), 22 } 23 for _, input := range cloneTests { 24 clone := strings.Clone(input) 25 if clone != input { 26 t.Errorf("Clone(%q) = %q; want %q", input, clone, input) 27 } 28 29 if len(input) != 0 && unsafe.StringData(clone) == unsafe.StringData(input) { 30 t.Errorf("Clone(%q) return value should not reference inputs backing memory.", input) 31 } 32 33 if len(input) == 0 && unsafe.StringData(clone) != unsafe.StringData(emptyString) { 34 t.Errorf("Clone(%#v) return value should be equal to empty string.", unsafe.StringData(input)) 35 } 36 } 37 } 38 39 func BenchmarkClone(b *testing.B) { 40 var str = strings.Repeat("a", 42) 41 b.ReportAllocs() 42 for i := 0; i < b.N; i++ { 43 stringSink = strings.Clone(str) 44 } 45 }