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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package stringsx
import (
"cmp"
"strings"
"testing"
)
func TestCompareFold(t *testing.T) {
tests := []struct {
a, b string
}{
// Basic ASCII cases
{"", ""},
{"a", "a"},
{"a", "A"},
{"A", "a"},
{"a", "b"},
{"b", "a"},
{"abc", "ABC"},
{"ABC", "abc"},
{"abc", "abd"},
{"abd", "abc"},
// Length differences
{"abc", "ab"},
{"ab", "abc"},
// Unicode cases
{"世界", "世界"},
{"Hello世界", "hello世界"},
{"世界Hello", "世界hello"},
{"世界", "世界x"},
{"世界x", "世界"},
// Special case folding examples
{"ß", "ss"}, // German sharp s
{"fi", "fi"}, // fi ligature
{"Σ", "σ"}, // Greek sigma
{"İ", "i\u0307"}, // Turkish dotted I
// Mixed cases
{"HelloWorld", "helloworld"},
{"HELLOWORLD", "helloworld"},
{"helloworld", "HELLOWORLD"},
{"HelloWorld", "helloworld"},
{"helloworld", "HelloWorld"},
// Edge cases
{" ", " "},
{"1", "1"},
{"123", "123"},
{"!@#", "!@#"},
}
wants := []int{}
for _, tt := range tests {
got := CompareFold(tt.a, tt.b)
want := cmp.Compare(strings.ToLower(tt.a), strings.ToLower(tt.b))
if got != want {
t.Errorf("CompareFold(%q, %q) = %v, want %v", tt.a, tt.b, got, want)
}
wants = append(wants, want)
}
if n := testing.AllocsPerRun(1000, func() {
for i, tt := range tests {
if CompareFold(tt.a, tt.b) != wants[i] {
panic("unexpected")
}
}
}); n > 0 {
t.Errorf("allocs = %v; want 0", int(n))
}
}
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