halkyon/halkyon_learn_curator/test/kana_test.dart

import 'package:halkyon_learn_curator/src/japanese/kana.dart';
import 'package:test/test.dart';

void main() {
  test('katakana becomes hiragana; the rest stays', () {
    expect(toHiragana('テレビ'), 'てれび');
    expect(toHiragana('カード'), 'かーど');
    expect(toHiragana('食べる'), '食べる');
  });

  test('kana become Hepburn romaji, as people type them', () {
    expect(toRomaji('たべる'), 'taberu');
    expect(toRomaji('とうきょう'), 'toukyou');
    expect(toRomaji('しゃしん'), 'shashin');
    expect(toRomaji('きって'), 'kitte');
    expect(toRomaji('まっちゃ'), 'matcha');
    expect(toRomaji('カード'), 'kaado');
    expect(toRomaji('パーティー'), 'paatii');
    expect(toRomaji('ふぁいる'), 'fairu');
    expect(toRomaji('ぢ'), 'ji');
    expect(toRomaji('デュエット'), 'dyuetto');
    expect(toRomaji('フュージョン'), 'fyuujon');
  });

  test('long vowels written once, where that differs', () {
    expect(withShortVowels('toukyou'), 'tokyo');
    expect(withShortVowels('kaado'), 'kado');
    expect(withShortVowels('oniisan'), 'onisan');
    expect(withShortVowels('taberu'), isNull);
  });

  test('full-width letters and digits become the ones people type', () {
    expect(halfWidth('Ｔシャツ'), 'Tシャツ');
    expect(halfWidth('３Ｄ　ＣＤ'), '3D CD');
    expect(halfWidth('東京'), '東京');
  });
}