Melo/test/library/my_music_screen_test.dart

import 'package:drift/drift.dart';
import 'package:drift/native.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/favorites_screen.dart';
import 'package:melo/library/library_service.dart';
import 'package:melo/library/my_music_screen.dart';
import 'package:melo/library/playlist_service.dart';
import 'package:melo/player/audio_handler.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

Widget _wrap(MeloDb db, LibraryService lib, PlaylistService playlists,
    MeloAudioHandler handler, Widget child) {
  return MultiProvider(
    providers: [
      Provider<MeloDb>.value(value: db),
      ChangeNotifierProvider<LibraryService>.value(value: lib),
      ChangeNotifierProvider<PlaylistService>.value(value: playlists),
      Provider<MeloAudioHandler>.value(value: handler),
    ],
    child: MaterialApp(home: Scaffold(body: child)),
  );
}

Future<void> _insert(
  MeloDb db, {
  required String id,
  required String title,
  int dateAddedMs = 0,
  int playCount = 0,
}) {
  return db.into(db.songs).insert(SongsCompanion.insert(
        id: id,
        path: '/$id.mp3',
        title: title,
        dateAddedMs: dateAddedMs,
        updatedAtMs: 0,
        playCount: Value(playCount),
      ));
}

void main() {
  setUp(() => SharedPreferences.setMockInitialValues({}));

  testWidgets('Meine Musik zeigt Kopfzeile, Schnellzugriffe und Shuffle',
      (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final lib = LibraryService(db);
    final playlists = PlaylistService(db);
    final handler = MeloAudioHandler(db: db);
    await _insert(db, id: '1', title: 'Song A');

    await tester.pumpWidget(
        _wrap(db, lib, playlists, handler, const MyMusicScreen()));
    await tester.pumpAndSettle();

    expect(find.text('Titel, Künstler und Alben suchen'), findsOneWidget);
    expect(find.text('Favoriten'), findsOneWidget);
    expect(find.text('Wiedergabelisten'), findsOneWidget);
    expect(find.text('Shuffle-Wiedergabe'), findsOneWidget);
    expect(find.text('Song A'), findsOneWidget);

    handler.dispose();
    await db.close();
  });

  testWidgets('Sortier-Menü bietet alle drei Kriterien und sortiert die Liste',
      (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final lib = LibraryService(db);
    final playlists = PlaylistService(db);
    final handler = MeloAudioHandler(db: db);
    await _insert(db, id: '1', title: 'Zenit', dateAddedMs: 300, playCount: 9);
    await _insert(db, id: '2', title: 'Anfang', dateAddedMs: 100, playCount: 1);

    await tester.pumpWidget(
        _wrap(db, lib, playlists, handler, const MyMusicScreen()));
    await tester.pumpAndSettle();

    // Standard: zuletzt hinzugefügt zuerst.
    var titles = tester.widgetList<Text>(find.byType(Text))
        .map((t) => t.data)
        .where((t) => t == 'Zenit' || t == 'Anfang')
        .toList();
    expect(titles.first, 'Zenit');

    await tester.tap(find.byIcon(Icons.swap_vert));
    await tester.pumpAndSettle();

    expect(find.text('Zuletzt hinzugefügt'), findsOneWidget);
    expect(find.text('Name (A–Z–#)'), findsOneWidget);
    expect(find.text('Wie oft abgespielt'), findsOneWidget);

    await tester.tap(find.text('Name (A–Z–#)'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Übernehmen'));
    await tester.pumpAndSettle();

    titles = tester.widgetList<Text>(find.byType(Text))
        .map((t) => t.data)
        .where((t) => t == 'Zenit' || t == 'Anfang')
        .toList();
    expect(titles.first, 'Anfang');

    handler.dispose();
    await db.close();
  });

  testWidgets('Favoriten-Tab zeigt nur favorisierte Songs mit Shuffle',
      (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final lib = LibraryService(db);
    final playlists = PlaylistService(db);
    final handler = MeloAudioHandler(db: db);
    await _insert(db, id: '1', title: 'Geliebt');
    await _insert(db, id: '2', title: 'Egal');
    await db.setFavorite('1', true);

    await tester.pumpWidget(
        _wrap(db, lib, playlists, handler, const FavoritesScreen()));
    await tester.pumpAndSettle();

    expect(find.text('Shuffle-Wiedergabe'), findsOneWidget);
    expect(find.text('Geliebt'), findsOneWidget);
    expect(find.text('Egal'), findsNothing);

    handler.dispose();
    await db.close();
  });

  testWidgets('Favoriten-Tab zeigt einen Hinweis, wenn nichts favorisiert ist',
      (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final lib = LibraryService(db);
    final playlists = PlaylistService(db);
    final handler = MeloAudioHandler(db: db);

    await tester.pumpWidget(
        _wrap(db, lib, playlists, handler, const FavoritesScreen()));
    await tester.pumpAndSettle();

    expect(find.text('Noch keine Favoriten'), findsOneWidget);

    handler.dispose();
    await db.close();
  });
}