Melo/test/library/song_list_navigation_test.dart

import 'package:audio_service/audio_service.dart';
import 'package:drift/drift.dart' show Value, driftRuntimeOptions;
import 'package:drift/native.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:melo/library/category_service.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/playlist_service.dart';
import 'package:melo/library/song_list.dart';
import 'package:melo/player/audio_handler.dart';
import 'package:melo/player/player_expansion_controller.dart';
import 'package:melo/settings/app_settings.dart';

/// Ersetzt in [MeloAudioHandler.loadPlaylist] den echten just_audio-Zugriff:
/// der spricht über Plattform-Kanäle, die im Widget-Test nicht existieren
/// und mit `MissingPluginException` scheitern würden. Alles andere
/// (Warteschlange, Mediendaten) bleibt echtes Handler-Verhalten.
class _FakeAudioHandler extends MeloAudioHandler {
  _FakeAudioHandler(MeloDb db) : super(db: db);

  @override
  Future<int> loadPlaylist(List<MediaItem> items, {int startIndex = 0}) async {
    queue.add(items);
    if (items.isNotEmpty) mediaItem.add(items[startIndex]);
    return 0;
  }
}

void main() {
  late MeloDb db;
  late CategoryService kategorien;
  late PlaylistService playlists;
  late AppSettings einstellungen;
  late _FakeAudioHandler handler;

  void stelleKanaeleRuhig() {
    final messenger =
        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger;
    messenger.setMockMethodCallHandler(
      const MethodChannel('plugins.flutter.io/path_provider'),
      (call) async => '/tmp/melo-test',
    );
    messenger.setMockMethodCallHandler(
      const MethodChannel('plugins.it_nomads.com/flutter_secure_storage'),
      (call) async => null,
    );
  }

  setUp(() async {
    TestWidgetsFlutterBinding.ensureInitialized();
    driftRuntimeOptions.dontWarnAboutMultipleDatabases = true;
    SharedPreferences.setMockInitialValues({});
    stelleKanaeleRuhig();
    db = MeloDb(NativeDatabase.memory());
    kategorien = CategoryService(db);
    playlists = PlaylistService(db);
    einstellungen = AppSettings();
    await einstellungen.init();
    handler = _FakeAudioHandler(db);
    await db.into(db.songs).insert(SongsCompanion.insert(
          id: 'song-1',
          path: '/music/roses.mp3',
          title: 'Roses',
          artist: const Value('Neoni'),
          dateAddedMs: 0,
          updatedAtMs: 0,
        ));
  });

  tearDown(() {
    handler.dispose();
    kategorien.dispose();
    playlists.dispose();
  });

  Song derSong() => Song(
        id: 'song-1',
        path: '/music/roses.mp3',
        title: 'Roses',
        artist: 'Neoni',
        dateAddedMs: 0,
        updatedAtMs: 0,
        deleted: false,
        playCount: 0,
        categoriesEdited: false,
        metadataEdited: false,
      );

  testWidgets('Song antippen öffnet den Vollbild-Player mit großem Cover',
      (tester) async {
    final expansion = PlayerExpansionController(vsync: tester);
    addTearDown(expansion.dispose);
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          Provider<MeloDb>.value(value: db),
          Provider<MeloAudioHandler>.value(value: handler),
          ChangeNotifierProvider<CategoryService>.value(value: kategorien),
          ChangeNotifierProvider<PlaylistService>.value(value: playlists),
          ChangeNotifierProvider<AppSettings>.value(value: einstellungen),
          ChangeNotifierProvider<PlayerExpansionController>.value(
              value: expansion),
        ],
        child: MaterialApp(
          home: Scaffold(
            body: SongZeile(
              song: derSong(),
              warteschlange: [derSong()],
              index: 0,
            ),
          ),
        ),
      ),
    );

    expect(expansion.progress, 0.0);

    await tester.tap(find.text('Roses'));
    await tester.pumpAndSettle();

    expect(expansion.progress, 1.0);

    // Ohne diesen Abschluss bleibt ein drift-Stream-Abo (Favoriten-Herz)
    // beim Abbau des Baums als offener Fake-Timer stehen — dieselbe
    // Aufräum-Zeile wie in song_zeile_lauf_test.dart.
    await tester.pumpWidget(const SizedBox());
    await tester.pump(const Duration(milliseconds: 1));
  });
}