Melo/test/library/song_sort_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/song_sort.dart';

Song _song(
  String title, {
  String? id,
  int dateAddedMs = 0,
  int playCount = 0,
}) {
  return Song(
    id: id ?? title,
    path: '/$title.mp3',
    title: title,
    dateAddedMs: dateAddedMs,
    updatedAtMs: 0,
    deleted: false,
    playCount: playCount,
  );
}

void main() {
  group('SortMode.name — A-Z, Ziffern/Zeichen unter # ans Ende', () {
    test('sortiert Buchstaben alphabetisch, Ziffern und Zeichen danach', () {
      final songs = [
        _song('9 Lives'),
        _song('Zenit'),
        _song('#Hashtag'),
        _song('Anfang'),
      ];

      final sorted = sortSongs(songs, SortMode.name, ascending: true);

      expect(sorted.map((s) => s.title), ['Anfang', 'Zenit', '#Hashtag', '9 Lives']);
    });

    test('ignoriert Groß-/Kleinschreibung', () {
      final songs = [_song('beta'), _song('Alpha'), _song('CHARLIE')];

      final sorted = sortSongs(songs, SortMode.name, ascending: true);

      expect(sorted.map((s) => s.title), ['Alpha', 'beta', 'CHARLIE']);
    });

    test('Umlaute sortieren wie ihr Grundbuchstabe', () {
      final songs = [_song('Zug'), _song('Ärger'), _song('Anfang'), _song('Öl')];

      final sorted = sortSongs(songs, SortMode.name, ascending: true);

      expect(sorted.map((s) => s.title), ['Anfang', 'Ärger', 'Öl', 'Zug']);
    });

    test('absteigend dreht die Reihenfolge um', () {
      final songs = [_song('Anfang'), _song('9 Lives'), _song('Zenit')];

      final sorted = sortSongs(songs, SortMode.name, ascending: false);

      expect(sorted.map((s) => s.title), ['9 Lives', 'Zenit', 'Anfang']);
    });
  });

  group('SortMode.dateAdded', () {
    test('absteigend = zuletzt hinzugefügt zuerst', () {
      final songs = [
        _song('Alt', dateAddedMs: 100),
        _song('Neu', dateAddedMs: 300),
        _song('Mittel', dateAddedMs: 200),
      ];

      final sorted = sortSongs(songs, SortMode.dateAdded, ascending: false);

      expect(sorted.map((s) => s.title), ['Neu', 'Mittel', 'Alt']);
    });

    test('aufsteigend = ältester zuerst', () {
      final songs = [
        _song('Neu', dateAddedMs: 300),
        _song('Alt', dateAddedMs: 100),
      ];

      final sorted = sortSongs(songs, SortMode.dateAdded, ascending: true);

      expect(sorted.map((s) => s.title), ['Alt', 'Neu']);
    });
  });

  group('SortMode.playCount', () {
    test('absteigend = meistgespielt zuerst', () {
      final songs = [
        _song('Selten', playCount: 1),
        _song('Oft', playCount: 42),
        _song('Nie', playCount: 0),
      ];

      final sorted = sortSongs(songs, SortMode.playCount, ascending: false);

      expect(sorted.map((s) => s.title), ['Oft', 'Selten', 'Nie']);
    });
  });

  group('Stabilität', () {
    test('gleiche Sortierwerte werden nach Titel entschieden', () {
      final songs = [
        _song('Bravo', id: 'b', dateAddedMs: 5),
        _song('Alpha', id: 'a', dateAddedMs: 5),
      ];

      final sorted = sortSongs(songs, SortMode.dateAdded, ascending: false);

      expect(sorted.map((s) => s.title), ['Alpha', 'Bravo']);
    });

    test('verändert die Eingabeliste nicht', () {
      final songs = [_song('Zenit'), _song('Anfang')];

      sortSongs(songs, SortMode.name, ascending: true);

      expect(songs.map((s) => s.title), ['Zenit', 'Anfang']);
    });
  });

  group('Standard-Richtung pro Modus', () {
    test('Datum und Wiedergaben starten absteigend, Name aufsteigend', () {
      expect(defaultAscending(SortMode.dateAdded), isFalse);
      expect(defaultAscending(SortMode.playCount), isFalse);
      expect(defaultAscending(SortMode.name), isTrue);
    });
  });

  group('Beschriftungen', () {
    test('jeder Modus hat ein deutsches Label', () {
      expect(SortMode.dateAdded.label, 'Zuletzt hinzugefügt');
      expect(SortMode.name.label, 'Name (A–Z–#)');
      expect(SortMode.playCount.label, 'Wie oft abgespielt');
    });
  });
}