Melo/test/playlists/playlists_screen_test.dart

import 'package:drift/native.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:provider/provider.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/playlist_service.dart';
import 'package:melo/playlists/playlists_screen.dart';

Widget _wrap(MeloDb db, PlaylistService service, Widget child) {
  return MultiProvider(
    providers: [
      Provider<MeloDb>.value(value: db),
      ChangeNotifierProvider<PlaylistService>.value(value: service),
    ],
    child: MaterialApp(home: child),
  );
}

void main() {
  testWidgets('zeigt Leer-Zustand ohne Playlisten', (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final service = PlaylistService(db);

    await tester.pumpWidget(_wrap(db, service, const PlaylistsScreen()));
    await tester.pumpAndSettle();

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

    await db.close();
  });

  testWidgets('zeigt angelegte Playlist in der Liste', (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final service = PlaylistService(db);
    await db.createPlaylist('Road Trip');

    await tester.pumpWidget(_wrap(db, service, const PlaylistsScreen()));
    await tester.pumpAndSettle();

    expect(find.text('Road Trip'), findsOneWidget);
    expect(find.text('0 Songs'), findsWidgets);

    await db.close();
  });
}