Melo/test/library/song_grouping_test.dart

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

Song _song({
  required String id,
  required String title,
  String? artist,
  String? album,
}) {
  return Song(
    id: id,
    path: '/$id.mp3',
    title: title,
    artist: artist,
    album: album,
    dateAddedMs: 0,
    updatedAtMs: 0,
    deleted: false,
    playCount: 0,
    categoriesEdited: false,
      metadataEdited: false,
  );
}

void main() {
  group('groupByArtist', () {
    test('gruppiert mehrere Künstler getrennt', () {
      final songs = [
        _song(id: '1', title: 'A', artist: 'Bob'),
        _song(id: '2', title: 'B', artist: 'Alice'),
        _song(id: '3', title: 'C', artist: 'Alice'),
      ];

      final grouped = groupByArtist(songs);

      expect(grouped.keys, ['Alice', 'Bob']);
      expect(grouped['Alice']!.length, 2);
      expect(grouped['Bob']!.length, 1);
    });

    test('gruppiert Songs ohne Künstler unter "Unbekannt"', () {
      final songs = [
        _song(id: '1', title: 'A', artist: null),
        _song(id: '2', title: 'B', artist: null),
      ];

      final grouped = groupByArtist(songs);

      expect(grouped.keys, [unbekannterKuenstler]);
      expect(grouped[unbekannterKuenstler]!.length, 2);
    });

    test('sortiert Künstlernamen alphabetisch', () {
      final songs = [
        _song(id: '1', title: 'A', artist: 'Zebra'),
        _song(id: '2', title: 'B', artist: 'Anton'),
        _song(id: '3', title: 'C', artist: 'Mitte'),
      ];

      final grouped = groupByArtist(songs);

      expect(grouped.keys.toList(), ['Anton', 'Mitte', 'Zebra']);
    });

    test('leere Liste ergibt leere Map', () {
      expect(groupByArtist(const []), isEmpty);
    });
  });

  group('groupByAlbum', () {
    test('bündelt Titel desselben Albums', () {
      final grouped = groupByAlbum([
        _song(id: 'a', title: 'A', album: 'Trailerpark'),
        _song(id: 'b', title: 'B', album: 'Trailerpark'),
        _song(id: 'c', title: 'C', album: 'Anderes'),
      ]);

      expect(grouped.keys, ['Anderes', 'Trailerpark']);
      expect(grouped['Trailerpark'], hasLength(2));
    });

    test('Titel ohne Album sammeln sich unter "Ohne Album"', () {
      final grouped = groupByAlbum([_song(id: 'a', title: 'A')]);

      expect(grouped.keys, [ohneAlbum]);
    });

    test('sortiert ohne Rücksicht auf Groß- und Kleinschreibung', () {
      final grouped = groupByAlbum([
        _song(id: 'a', title: 'A', album: 'zeta'),
        _song(id: 'b', title: 'B', album: 'Alpha'),
      ]);

      expect(grouped.keys, ['Alpha', 'zeta']);
    });
  });
}