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Source file src/unicode/utf16/utf16_test.go

Documentation: unicode/utf16

  // 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 (
  	"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 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 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 http://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 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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