Melo/test/library/playlist_service_test.dart

import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/playlist_service.dart';

void main() {
  late MeloDb db;
  late PlaylistService service;

  setUp(() {
    db = MeloDb(NativeDatabase.memory());
    service = PlaylistService(db);
  });

  tearDown(() async => db.close());

  test('createPlaylist delegates to db and notifies listeners', () async {
    var notified = false;
    service.addListener(() => notified = true);

    await service.createPlaylist('Road Trip');

    final playlists = await db.watchPlaylists().first;
    expect(playlists.length, 1);
    expect(playlists.first.name, 'Road Trip');
    expect(notified, true);
  });

  test('toggleFavorite delegates to db and notifies listeners', () async {
    await db.into(db.songs).insert(SongsCompanion.insert(
      id: 'song-1', path: '/a.mp3', title: 'A', dateAddedMs: 0, updatedAtMs: 0,
    ));

    var notified = false;
    service.addListener(() => notified = true);

    await service.toggleFavorite('song-1');

    expect(await db.watchIsFavorite('song-1').first, true);
    expect(notified, true);
  });
}