tests/lib/convert/utf84_test.dart

// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:expect/expect.dart';
import 'dart:convert';
import 'dart:typed_data' show Uint8List;

const String testEnglishPhrase = "The quick brown fox jumps over the lazy dog.";

const List<int> testEnglishUtf8 = const <int>[
  0x54,
  0x68,
  0x65,
  0x20,
  0x71,
  0x75,
  0x69,
  0x63,
  0x6b,
  0x20,
  0x62,
  0x72,
  0x6f,
  0x77,
  0x6e,
  0x20,
  0x66,
  0x6f,
  0x78,
  0x20,
  0x6a,
  0x75,
  0x6d,
  0x70,
  0x73,
  0x20,
  0x6f,
  0x76,
  0x65,
  0x72,
  0x20,
  0x74,
  0x68,
  0x65,
  0x20,
  0x6c,
  0x61,
  0x7a,
  0x79,
  0x20,
  0x64,
  0x6f,
  0x67,
  0x2e,
];

const String testDanishPhrase =
    "Quizdeltagerne spiste jordbær med "
    "fløde mens cirkusklovnen Wolther spillede på xylofon.";

const List<int> testDanishUtf8 = const <int>[
  0x51,
  0x75,
  0x69,
  0x7a,
  0x64,
  0x65,
  0x6c,
  0x74,
  0x61,
  0x67,
  0x65,
  0x72,
  0x6e,
  0x65,
  0x20,
  0x73,
  0x70,
  0x69,
  0x73,
  0x74,
  0x65,
  0x20,
  0x6a,
  0x6f,
  0x72,
  0x64,
  0x62,
  0xc3,
  0xa6,
  0x72,
  0x20,
  0x6d,
  0x65,
  0x64,
  0x20,
  0x66,
  0x6c,
  0xc3,
  0xb8,
  0x64,
  0x65,
  0x20,
  0x6d,
  0x65,
  0x6e,
  0x73,
  0x20,
  0x63,
  0x69,
  0x72,
  0x6b,
  0x75,
  0x73,
  0x6b,
  0x6c,
  0x6f,
  0x76,
  0x6e,
  0x65,
  0x6e,
  0x20,
  0x57,
  0x6f,
  0x6c,
  0x74,
  0x68,
  0x65,
  0x72,
  0x20,
  0x73,
  0x70,
  0x69,
  0x6c,
  0x6c,
  0x65,
  0x64,
  0x65,
  0x20,
  0x70,
  0xc3,
  0xa5,
  0x20,
  0x78,
  0x79,
  0x6c,
  0x6f,
  0x66,
  0x6f,
  0x6e,
  0x2e,
];

// unusual formatting due to strange editor interaction w/ text direction.
const String testHebrewPhrase =
    "דג סקרן שט בים מאוכזב ולפתע מצא לו חברה איך הקליטה";

const List<int> testHebrewUtf8 = const <int>[
  0xd7,
  0x93,
  0xd7,
  0x92,
  0x20,
  0xd7,
  0xa1,
  0xd7,
  0xa7,
  0xd7,
  0xa8,
  0xd7,
  0x9f,
  0x20,
  0xd7,
  0xa9,
  0xd7,
  0x98,
  0x20,
  0xd7,
  0x91,
  0xd7,
  0x99,
  0xd7,
  0x9d,
  0x20,
  0xd7,
  0x9e,
  0xd7,
  0x90,
  0xd7,
  0x95,
  0xd7,
  0x9b,
  0xd7,
  0x96,
  0xd7,
  0x91,
  0x20,
  0xd7,
  0x95,
  0xd7,
  0x9c,
  0xd7,
  0xa4,
  0xd7,
  0xaa,
  0xd7,
  0xa2,
  0x20,
  0xd7,
  0x9e,
  0xd7,
  0xa6,
  0xd7,
  0x90,
  0x20,
  0xd7,
  0x9c,
  0xd7,
  0x95,
  0x20,
  0xd7,
  0x97,
  0xd7,
  0x91,
  0xd7,
  0xa8,
  0xd7,
  0x94,
  0x20,
  0xd7,
  0x90,
  0xd7,
  0x99,
  0xd7,
  0x9a,
  0x20,
  0xd7,
  0x94,
  0xd7,
  0xa7,
  0xd7,
  0x9c,
  0xd7,
  0x99,
  0xd7,
  0x98,
  0xd7,
  0x94,
];

const String testRussianPhrase =
    "Съешь же ещё этих мягких "
    "французских булок да выпей чаю";

const List<int> testRussianUtf8 = const <int>[
  0xd0,
  0xa1,
  0xd1,
  0x8a,
  0xd0,
  0xb5,
  0xd1,
  0x88,
  0xd1,
  0x8c,
  0x20,
  0xd0,
  0xb6,
  0xd0,
  0xb5,
  0x20,
  0xd0,
  0xb5,
  0xd1,
  0x89,
  0xd1,
  0x91,
  0x20,
  0xd1,
  0x8d,
  0xd1,
  0x82,
  0xd0,
  0xb8,
  0xd1,
  0x85,
  0x20,
  0xd0,
  0xbc,
  0xd1,
  0x8f,
  0xd0,
  0xb3,
  0xd0,
  0xba,
  0xd0,
  0xb8,
  0xd1,
  0x85,
  0x20,
  0xd1,
  0x84,
  0xd1,
  0x80,
  0xd0,
  0xb0,
  0xd0,
  0xbd,
  0xd1,
  0x86,
  0xd1,
  0x83,
  0xd0,
  0xb7,
  0xd1,
  0x81,
  0xd0,
  0xba,
  0xd0,
  0xb8,
  0xd1,
  0x85,
  0x20,
  0xd0,
  0xb1,
  0xd1,
  0x83,
  0xd0,
  0xbb,
  0xd0,
  0xbe,
  0xd0,
  0xba,
  0x20,
  0xd0,
  0xb4,
  0xd0,
  0xb0,
  0x20,
  0xd0,
  0xb2,
  0xd1,
  0x8b,
  0xd0,
  0xbf,
  0xd0,
  0xb5,
  0xd0,
  0xb9,
  0x20,
  0xd1,
  0x87,
  0xd0,
  0xb0,
  0xd1,
  0x8e,
];

const String testGreekPhrase =
    "Γαζέες καὶ μυρτιὲς δὲν θὰ βρῶ πιὰ "
    "στὸ χρυσαφὶ ξέφωτο";

const List<int> testGreekUtf8 = const <int>[
  0xce,
  0x93,
  0xce,
  0xb1,
  0xce,
  0xb6,
  0xce,
  0xad,
  0xce,
  0xb5,
  0xcf,
  0x82,
  0x20,
  0xce,
  0xba,
  0xce,
  0xb1,
  0xe1,
  0xbd,
  0xb6,
  0x20,
  0xce,
  0xbc,
  0xcf,
  0x85,
  0xcf,
  0x81,
  0xcf,
  0x84,
  0xce,
  0xb9,
  0xe1,
  0xbd,
  0xb2,
  0xcf,
  0x82,
  0x20,
  0xce,
  0xb4,
  0xe1,
  0xbd,
  0xb2,
  0xce,
  0xbd,
  0x20,
  0xce,
  0xb8,
  0xe1,
  0xbd,
  0xb0,
  0x20,
  0xce,
  0xb2,
  0xcf,
  0x81,
  0xe1,
  0xbf,
  0xb6,
  0x20,
  0xcf,
  0x80,
  0xce,
  0xb9,
  0xe1,
  0xbd,
  0xb0,
  0x20,
  0xcf,
  0x83,
  0xcf,
  0x84,
  0xe1,
  0xbd,
  0xb8,
  0x20,
  0xcf,
  0x87,
  0xcf,
  0x81,
  0xcf,
  0x85,
  0xcf,
  0x83,
  0xce,
  0xb1,
  0xcf,
  0x86,
  0xe1,
  0xbd,
  0xb6,
  0x20,
  0xce,
  0xbe,
  0xce,
  0xad,
  0xcf,
  0x86,
  0xcf,
  0x89,
  0xcf,
  0x84,
  0xce,
  0xbf,
];

const String testKatakanaPhrase =
    "イロハニホヘト チリヌルヲ ワカヨタレソ "
    "ツネナラム ウヰノオクヤマ ケフコエテ アサキユメミシ ヱヒモセスン";

const List<int> testKatakanaUtf8 = const <int>[
  0xe3,
  0x82,
  0xa4,
  0xe3,
  0x83,
  0xad,
  0xe3,
  0x83,
  0x8f,
  0xe3,
  0x83,
  0x8b,
  0xe3,
  0x83,
  0x9b,
  0xe3,
  0x83,
  0x98,
  0xe3,
  0x83,
  0x88,
  0x20,
  0xe3,
  0x83,
  0x81,
  0xe3,
  0x83,
  0xaa,
  0xe3,
  0x83,
  0x8c,
  0xe3,
  0x83,
  0xab,
  0xe3,
  0x83,
  0xb2,
  0x20,
  0xe3,
  0x83,
  0xaf,
  0xe3,
  0x82,
  0xab,
  0xe3,
  0x83,
  0xa8,
  0xe3,
  0x82,
  0xbf,
  0xe3,
  0x83,
  0xac,
  0xe3,
  0x82,
  0xbd,
  0x20,
  0xe3,
  0x83,
  0x84,
  0xe3,
  0x83,
  0x8d,
  0xe3,
  0x83,
  0x8a,
  0xe3,
  0x83,
  0xa9,
  0xe3,
  0x83,
  0xa0,
  0x20,
  0xe3,
  0x82,
  0xa6,
  0xe3,
  0x83,
  0xb0,
  0xe3,
  0x83,
  0x8e,
  0xe3,
  0x82,
  0xaa,
  0xe3,
  0x82,
  0xaf,
  0xe3,
  0x83,
  0xa4,
  0xe3,
  0x83,
  0x9e,
  0x20,
  0xe3,
  0x82,
  0xb1,
  0xe3,
  0x83,
  0x95,
  0xe3,
  0x82,
  0xb3,
  0xe3,
  0x82,
  0xa8,
  0xe3,
  0x83,
  0x86,
  0x20,
  0xe3,
  0x82,
  0xa2,
  0xe3,
  0x82,
  0xb5,
  0xe3,
  0x82,
  0xad,
  0xe3,
  0x83,
  0xa6,
  0xe3,
  0x83,
  0xa1,
  0xe3,
  0x83,
  0x9f,
  0xe3,
  0x82,
  0xb7,
  0x20,
  0xe3,
  0x83,
  0xb1,
  0xe3,
  0x83,
  0x92,
  0xe3,
  0x83,
  0xa2,
  0xe3,
  0x82,
  0xbb,
  0xe3,
  0x82,
  0xb9,
  0xe3,
  0x83,
  0xb3,
];

void main() {
  testEncodeToUtf8();

  String decodeUtf8List(List<int> codeUnits) => utf8.decode(codeUnits);
  String decodeUtf8Uint8List(List<int> codeUnits) =>
      utf8.decode(new Uint8List.fromList(codeUnits));

  testUtf8BytesToString(decodeUtf8List);
  testUtf8BytesToString(decodeUtf8Uint8List);

  List<int> utf8ToRunes1(List<int> codeUnits) {
    return utf8.decode(codeUnits, allowMalformed: true).runes.toList();
  }

  List<int> utf8ToRunes2(List<int> codeUnits) {
    return utf8
        .decode(new Uint8List.fromList(codeUnits), allowMalformed: true)
        .runes
        .toList();
  }

  testUtf8bytesToCodepoints(utf8ToRunes1);
  testUtf8bytesToCodepoints(utf8ToRunes2);
}

void testEncodeToUtf8() {
  List<int> encodeUtf8(String str) => utf8.encode(str);

  Expect.listEquals(
    testEnglishUtf8,
    encodeUtf8(testEnglishPhrase),
    "english to utf8",
  );

  Expect.listEquals(
    testDanishUtf8,
    encodeUtf8(testDanishPhrase),
    "encode danish to utf8",
  );

  Expect.listEquals(
    testHebrewUtf8,
    encodeUtf8(testHebrewPhrase),
    "Hebrew to utf8",
  );

  Expect.listEquals(
    testRussianUtf8,
    encodeUtf8(testRussianPhrase),
    "Russian to utf8",
  );

  Expect.listEquals(
    testGreekUtf8,
    encodeUtf8(testGreekPhrase),
    "Greek to utf8",
  );

  Expect.listEquals(
    testKatakanaUtf8,
    encodeUtf8(testKatakanaPhrase),
    "Katakana to utf8",
  );
}

void testUtf8bytesToCodepoints(List<int> utf8ToRunes(List<int> utf8)) {
  Expect.listEquals(
    [954, 972, 963, 956, 949],
    utf8ToRunes([0xce, 0xba, 0xcf, 0x8c, 0xcf, 0x83, 0xce, 0xbc, 0xce, 0xb5]),
    "κόσμε",
  );

  // boundary conditions: First possible sequence of a certain length
  Expect.listEquals([], utf8ToRunes([]), "no input");
  Expect.listEquals([0x0], utf8ToRunes([0x0]), "0");
  Expect.listEquals([0x80], utf8ToRunes([0xc2, 0x80]), "80");
  Expect.listEquals([0x800], utf8ToRunes([0xe0, 0xa0, 0x80]), "800");
  Expect.listEquals([0x10000], utf8ToRunes([0xf0, 0x90, 0x80, 0x80]), "10000");
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf8, 0x88, 0x80, 0x80, 0x80]),
    "200000",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfc, 0x84, 0x80, 0x80, 0x80, 0x80]),
    "4000000",
  );

  // boundary conditions: Last possible sequence of a certain length
  Expect.listEquals([0x7f], utf8ToRunes([0x7f]), "7f");
  Expect.listEquals([0x7ff], utf8ToRunes([0xdf, 0xbf]), "7ff");
  Expect.listEquals([0xffff], utf8ToRunes([0xef, 0xbf, 0xbf]), "ffff");
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf7, 0xbf, 0xbf, 0xbf]),
    "1fffff",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfb, 0xbf, 0xbf, 0xbf, 0xbf]),
    "3ffffff",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfd, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf]),
    "4000000",
  );

  // other boundary conditions
  Expect.listEquals([0xd7ff], utf8ToRunes([0xed, 0x9f, 0xbf]), "d7ff");
  Expect.listEquals([0xe000], utf8ToRunes([0xee, 0x80, 0x80]), "e000");
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xef, 0xbf, 0xbd]),
    "fffd",
  );
  Expect.listEquals(
    [0x10ffff],
    utf8ToRunes([0xf4, 0x8f, 0xbf, 0xbf]),
    "10ffff",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf4, 0x90, 0x80, 0x80]),
    "110000",
  );

  // unexpected continuation bytes
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0x80]),
    "80 => replacement character",
  );
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xbf]),
    "bf => replacement character",
  );

  List<int> allContinuationBytes = <int>[];
  List<int> matchingReplacementChars = <int>[];
  for (int i = 0x80; i < 0xc0; i++) {
    allContinuationBytes.add(i);
    matchingReplacementChars.add(unicodeReplacementCharacterRune);
  }
  Expect.listEquals(
    matchingReplacementChars,
    utf8ToRunes(allContinuationBytes),
    "80 - bf => replacement character x 64",
  );

  List<int> allFirstTwoByteSeq = <int>[];
  matchingReplacementChars = <int>[];
  for (int i = 0xc0; i < 0xe0; i++) {
    allFirstTwoByteSeq.addAll([i, 0x20]);
    matchingReplacementChars.addAll([unicodeReplacementCharacterRune, 0x20]);
  }
  Expect.listEquals(
    matchingReplacementChars,
    utf8ToRunes(allFirstTwoByteSeq),
    "c0 - df + space => replacement character + space x 32",
  );

  List<int> allFirstThreeByteSeq = <int>[];
  matchingReplacementChars = <int>[];
  for (int i = 0xe0; i < 0xf0; i++) {
    allFirstThreeByteSeq.addAll([i, 0x20]);
    matchingReplacementChars.addAll([unicodeReplacementCharacterRune, 0x20]);
  }
  Expect.listEquals(
    matchingReplacementChars,
    utf8ToRunes(allFirstThreeByteSeq),
    "e0 - ef + space => replacement character x 16",
  );

  List<int> allFirstFourByteSeq = <int>[];
  matchingReplacementChars = <int>[];
  for (int i = 0xf0; i < 0xf8; i++) {
    allFirstFourByteSeq.addAll([i, 0x20]);
    matchingReplacementChars.addAll([unicodeReplacementCharacterRune, 0x20]);
  }
  Expect.listEquals(
    matchingReplacementChars,
    utf8ToRunes(allFirstFourByteSeq),
    "f0 - f7 + space => replacement character x 8",
  );

  List<int> allFirstFiveByteSeq = <int>[];
  matchingReplacementChars = <int>[];
  for (int i = 0xf8; i < 0xfc; i++) {
    allFirstFiveByteSeq.addAll([i, 0x20]);
    matchingReplacementChars.addAll([unicodeReplacementCharacterRune, 0x20]);
  }
  Expect.listEquals(
    matchingReplacementChars,
    utf8ToRunes(allFirstFiveByteSeq),
    "f8 - fb + space => replacement character x 4",
  );

  List<int> allFirstSixByteSeq = <int>[];
  matchingReplacementChars = <int>[];
  for (int i = 0xfc; i < 0xfe; i++) {
    allFirstSixByteSeq.addAll([i, 0x20]);
    matchingReplacementChars.addAll([unicodeReplacementCharacterRune, 0x20]);
  }
  Expect.listEquals(
    matchingReplacementChars,
    utf8ToRunes(allFirstSixByteSeq),
    "fc - fd + space => replacement character x 2",
  );

  // Sequences with last continuation byte missing
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xc2]),
    "2-byte sequence with last byte missing",
  );
  Expect.listEquals(
    [unicodeReplacementCharacterRune, unicodeReplacementCharacterRune],
    utf8ToRunes([0xe0, 0x80]),
    "3-byte sequence with last byte missing",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf0, 0x80, 0x80]),
    "4-byte sequence with last byte missing",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf8, 0x88, 0x80, 0x80]),
    "5-byte sequence with last byte missing",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfc, 0x80, 0x80, 0x80, 0x80]),
    "6-byte sequence with last byte missing",
  );

  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xdf]),
    "2-byte sequence with last byte missing (hi)",
  );
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xef, 0xbf]),
    "3-byte sequence with last byte missing (hi)",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf7, 0xbf, 0xbf]),
    "4-byte sequence with last byte missing (hi)",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfb, 0xbf, 0xbf, 0xbf]),
    "5-byte sequence with last byte missing (hi)",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfd, 0xbf, 0xbf, 0xbf, 0xbf]),
    "6-byte sequence with last byte missing (hi)",
  );

  // Concatenation of incomplete sequences
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([
      0xc2,
      0xe0,
      0x80,
      0xf0,
      0x80,
      0x80,
      0xf8,
      0x88,
      0x80,
      0x80,
      0xfc,
      0x80,
      0x80,
      0x80,
      0x80,
      0xdf,
      0xef, // These two bytes form one incomplete sequence.
      0xbf, // All others form one per byte.
      0xf7,
      0xbf,
      0xbf,
      0xfb,
      0xbf,
      0xbf,
      0xbf,
      0xfd,
      0xbf,
      0xbf,
      0xbf,
      0xbf,
    ]),
    "Concatenation of incomplete sequences",
  );

  // Impossible bytes
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xfe]),
    "fe",
  );
  Expect.listEquals(
    [unicodeReplacementCharacterRune],
    utf8ToRunes([0xff]),
    "ff",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfe, 0xfe, 0xff, 0xff]),
    "fe fe ff ff",
  );

  // Overlong sequences
  Expect.listEquals(
    [unicodeReplacementCharacterRune, unicodeReplacementCharacterRune],
    utf8ToRunes([0xc0, 0xaf]),
    "c0 af",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xe0, 0x80, 0xaf]),
    "e0 80 af",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf0, 0x80, 0x80, 0xaf]),
    "f0 80 80 af",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf8, 0x80, 0x80, 0x80, 0xaf]),
    "f8 80 80 80 af",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfc, 0x80, 0x80, 0x80, 0x80, 0xaf]),
    "fc 80 80 80 80 af",
  );

  Expect.listEquals(
    [unicodeReplacementCharacterRune, unicodeReplacementCharacterRune],
    utf8ToRunes([0xc1, 0xbf]),
    "c1 bf",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xe0, 0x9f, 0xbf]),
    "e0 9f bf",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf0, 0x8f, 0xbf, 0xbf]),
    "f0 8f bf bf",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf8, 0x87, 0xbf, 0xbf, 0xbf]),
    "f8 87 bf bf bf",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfc, 0x83, 0xbf, 0xbf, 0xbf, 0xbf]),
    "fc 83 bf bf bf bf",
  );

  Expect.listEquals(
    [unicodeReplacementCharacterRune, unicodeReplacementCharacterRune],
    utf8ToRunes([0xc0, 0x80]),
    "c0 80",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xe0, 0x80, 0x80]),
    "e0 80 80",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf0, 0x80, 0x80, 0x80]),
    "f0 80 80 80",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xf8, 0x80, 0x80, 0x80, 0x80]),
    "f8 80 80 80 80",
  );
  Expect.listEquals(
    [
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
      unicodeReplacementCharacterRune,
    ],
    utf8ToRunes([0xfc, 0x80, 0x80, 0x80, 0x80, 0x80]),
    "fc 80 80 80 80 80",
  );

  // Other illegal code positions (???)
  Expect.listEquals([0xfffe], utf8ToRunes([0xef, 0xbf, 0xbe]), "U+FFFE");
  Expect.listEquals([0xffff], utf8ToRunes([0xef, 0xbf, 0xbf]), "U+FFFF");
}

void testUtf8BytesToString(String decodeUtf8(List<int> input)) {
  Expect.stringEquals(
    testEnglishPhrase,
    decodeUtf8(testEnglishUtf8),
    "English",
  );

  Expect.stringEquals(testDanishPhrase, decodeUtf8(testDanishUtf8), "Danish");

  Expect.stringEquals(testHebrewPhrase, decodeUtf8(testHebrewUtf8), "Hebrew");

  Expect.stringEquals(
    testRussianPhrase,
    decodeUtf8(testRussianUtf8),
    "Russian",
  );

  Expect.stringEquals(testGreekPhrase, decodeUtf8(testGreekUtf8), "Greek");

  Expect.stringEquals(
    testKatakanaPhrase,
    decodeUtf8(testKatakanaUtf8),
    "Katakana",
  );
}