// 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.

// @dart = 2.9

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");
}