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('gruppiert mehrere Alben getrennt', () {
      final songs = [
        _song(id: '1', title: 'A', album: 'Best Of'),
        _song(id: '2', title: 'B', album: 'Anthology'),
      ];

      final grouped = groupByAlbum(songs);

      expect(grouped.keys.toList(), ['Anthology', 'Best Of']);
    });

    test('gruppiert Songs ohne Album unter "Unbekanntes Album"', () {
      final songs = [_song(id: '1', title: 'A', album: null)];

      final grouped = groupByAlbum(songs);

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

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

  group('albumArtistLabel', () {
    test('zeigt gemeinsamen Künstler, wenn alle Songs von ihm stammen', () {
      final songs = [
        _song(id: '1', title: 'A', artist: 'Alice', album: 'X'),
        _song(id: '2', title: 'B', artist: 'Alice', album: 'X'),
      ];

      expect(albumArtistLabel(songs), 'Alice');
    });

    test('zeigt "Verschiedene Interpreten" bei unterschiedlichen Künstlern', () {
      final songs = [
        _song(id: '1', title: 'A', artist: 'Alice', album: 'X'),
        _song(id: '2', title: 'B', artist: 'Bob', album: 'X'),
      ];

      expect(albumArtistLabel(songs), 'Verschiedene Interpreten');
    });
  });
}