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Current File : /proc/self/root/proc/self/root/opt/golang/1.22.0/src/unicode/utf16/utf16_test.go

// Copyright 2010 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 utf16_test

import (
	"internal/testenv"
	"reflect"
	"testing"
	"unicode"
	. "unicode/utf16"
)

// Validate the constants redefined from unicode.
func TestConstants(t *testing.T) {
	if MaxRune != unicode.MaxRune {
		t.Errorf("utf16.maxRune is wrong: %x should be %x", MaxRune, unicode.MaxRune)
	}
	if ReplacementChar != unicode.ReplacementChar {
		t.Errorf("utf16.replacementChar is wrong: %x should be %x", ReplacementChar, unicode.ReplacementChar)
	}
}

type encodeTest struct {
	in  []rune
	out []uint16
}

var encodeTests = []encodeTest{
	{[]rune{1, 2, 3, 4}, []uint16{1, 2, 3, 4}},
	{[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff},
		[]uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff}},
	{[]rune{'a', 'b', 0xd7ff, 0xd800, 0xdfff, 0xe000, 0x110000, -1},
		[]uint16{'a', 'b', 0xd7ff, 0xfffd, 0xfffd, 0xe000, 0xfffd, 0xfffd}},
}

func TestEncode(t *testing.T) {
	for _, tt := range encodeTests {
		out := Encode(tt.in)
		if !reflect.DeepEqual(out, tt.out) {
			t.Errorf("Encode(%x) = %x; want %x", tt.in, out, tt.out)
		}
	}
}

func TestAppendRune(t *testing.T) {
	for _, tt := range encodeTests {
		var out []uint16
		for _, u := range tt.in {
			out = AppendRune(out, u)
		}
		if !reflect.DeepEqual(out, tt.out) {
			t.Errorf("AppendRune(%x) = %x; want %x", tt.in, out, tt.out)
		}
	}
}

func TestEncodeRune(t *testing.T) {
	for i, tt := range encodeTests {
		j := 0
		for _, r := range tt.in {
			r1, r2 := EncodeRune(r)
			if r < 0x10000 || r > unicode.MaxRune {
				if j >= len(tt.out) {
					t.Errorf("#%d: ran out of tt.out", i)
					break
				}
				if r1 != unicode.ReplacementChar || r2 != unicode.ReplacementChar {
					t.Errorf("EncodeRune(%#x) = %#x, %#x; want 0xfffd, 0xfffd", r, r1, r2)
				}
				j++
			} else {
				if j+1 >= len(tt.out) {
					t.Errorf("#%d: ran out of tt.out", i)
					break
				}
				if r1 != rune(tt.out[j]) || r2 != rune(tt.out[j+1]) {
					t.Errorf("EncodeRune(%#x) = %#x, %#x; want %#x, %#x", r, r1, r2, tt.out[j], tt.out[j+1])
				}
				j += 2
				dec := DecodeRune(r1, r2)
				if dec != r {
					t.Errorf("DecodeRune(%#x, %#x) = %#x; want %#x", r1, r2, dec, r)
				}
			}
		}
		if j != len(tt.out) {
			t.Errorf("#%d: EncodeRune didn't generate enough output", i)
		}
	}
}

type decodeTest struct {
	in  []uint16
	out []rune
}

var decodeTests = []decodeTest{
	{[]uint16{1, 2, 3, 4}, []rune{1, 2, 3, 4}},
	{[]uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff},
		[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff}},
	{[]uint16{0xd800, 'a'}, []rune{0xfffd, 'a'}},
	{[]uint16{0xdfff}, []rune{0xfffd}},
}

func TestAllocationsDecode(t *testing.T) {
	testenv.SkipIfOptimizationOff(t)

	for _, tt := range decodeTests {
		allocs := testing.AllocsPerRun(10, func() {
			out := Decode(tt.in)
			if out == nil {
				t.Errorf("Decode(%x) = nil", tt.in)
			}
		})
		if allocs > 0 {
			t.Errorf("Decode allocated %v times", allocs)
		}
	}
}

func TestDecode(t *testing.T) {
	for _, tt := range decodeTests {
		out := Decode(tt.in)
		if !reflect.DeepEqual(out, tt.out) {
			t.Errorf("Decode(%x) = %x; want %x", tt.in, out, tt.out)
		}
	}
}

var decodeRuneTests = []struct {
	r1, r2 rune
	want   rune
}{
	{0xd800, 0xdc00, 0x10000},
	{0xd800, 0xdc01, 0x10001},
	{0xd808, 0xdf45, 0x12345},
	{0xdbff, 0xdfff, 0x10ffff},
	{0xd800, 'a', 0xfffd}, // illegal, replacement rune substituted
}

func TestDecodeRune(t *testing.T) {
	for i, tt := range decodeRuneTests {
		got := DecodeRune(tt.r1, tt.r2)
		if got != tt.want {
			t.Errorf("%d: DecodeRune(%q, %q) = %v; want %v", i, tt.r1, tt.r2, got, tt.want)
		}
	}
}

var surrogateTests = []struct {
	r    rune
	want bool
}{
	// from https://en.wikipedia.org/wiki/UTF-16
	{'\u007A', false},     // LATIN SMALL LETTER Z
	{'\u6C34', false},     // CJK UNIFIED IDEOGRAPH-6C34 (water)
	{'\uFEFF', false},     // Byte Order Mark
	{'\U00010000', false}, // LINEAR B SYLLABLE B008 A (first non-BMP code point)
	{'\U0001D11E', false}, // MUSICAL SYMBOL G CLEF
	{'\U0010FFFD', false}, // PRIVATE USE CHARACTER-10FFFD (last Unicode code point)

	{rune(0xd7ff), false}, // surr1-1
	{rune(0xd800), true},  // surr1
	{rune(0xdc00), true},  // surr2
	{rune(0xe000), false}, // surr3
	{rune(0xdfff), true},  // surr3-1
}

func TestIsSurrogate(t *testing.T) {
	for i, tt := range surrogateTests {
		got := IsSurrogate(tt.r)
		if got != tt.want {
			t.Errorf("%d: IsSurrogate(%q) = %v; want %v", i, tt.r, got, tt.want)
		}
	}
}

func BenchmarkDecodeValidASCII(b *testing.B) {
	// "hello world"
	data := []uint16{104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100}
	for i := 0; i < b.N; i++ {
		Decode(data)
	}
}

func BenchmarkDecodeValidJapaneseChars(b *testing.B) {
	// "日本語日本語日本語"
	data := []uint16{26085, 26412, 35486, 26085, 26412, 35486, 26085, 26412, 35486}
	for i := 0; i < b.N; i++ {
		Decode(data)
	}
}

func BenchmarkDecodeRune(b *testing.B) {
	rs := make([]rune, 10)
	// U+1D4D0 to U+1D4D4: MATHEMATICAL BOLD SCRIPT CAPITAL LETTERS
	for i, u := range []rune{'𝓐', '𝓑', '𝓒', '𝓓', '𝓔'} {
		rs[2*i], rs[2*i+1] = EncodeRune(u)
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		for j := 0; j < 5; j++ {
			DecodeRune(rs[2*j], rs[2*j+1])
		}
	}
}

func BenchmarkEncodeValidASCII(b *testing.B) {
	data := []rune{'h', 'e', 'l', 'l', 'o'}
	for i := 0; i < b.N; i++ {
		Encode(data)
	}
}

func BenchmarkEncodeValidJapaneseChars(b *testing.B) {
	data := []rune{'日', '本', '語'}
	for i := 0; i < b.N; i++ {
		Encode(data)
	}
}

func BenchmarkAppendRuneValidASCII(b *testing.B) {
	data := []rune{'h', 'e', 'l', 'l', 'o'}
	a := make([]uint16, 0, len(data)*2)
	for i := 0; i < b.N; i++ {
		for _, u := range data {
			a = AppendRune(a, u)
		}
		a = a[:0]
	}
}

func BenchmarkAppendRuneValidJapaneseChars(b *testing.B) {
	data := []rune{'日', '本', '語'}
	a := make([]uint16, 0, len(data)*2)
	for i := 0; i < b.N; i++ {
		for _, u := range data {
			a = AppendRune(a, u)
		}
		a = a[:0]
	}
}

func BenchmarkEncodeRune(b *testing.B) {
	for i := 0; i < b.N; i++ {
		for _, u := range []rune{'𝓐', '𝓑', '𝓒', '𝓓', '𝓔'} {
			EncodeRune(u)
		}
	}
}

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