Melo/test/library/my_music_tabs_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/category_service.dart';
import 'package:melo/library/database.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:melo/settings/app_settings.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),
      ChangeNotifierProvider<CategoryService>(create: (_) => CategoryService(db)),
      ChangeNotifierProvider<AppSettings>(create: (_) => AppSettings()),
    ],
    child: MaterialApp(home: Scaffold(body: child)),
  );
}

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

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

  testWidgets('Meine Musik hat die Unterreiter Lieder, Kategorie und Künstler',
      (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', artist: 'Neoni', album: 'Roses');

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

    expect(find.text('Lieder'), findsOneWidget);
    expect(find.text('Kategorie'), findsOneWidget);
    expect(find.text('Künstler'), findsOneWidget);
    // Der Alben-Reiter ist im Kategorie-Reiter aufgegangen.
    expect(find.text('Alben'), findsNothing);

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

  testWidgets('Unterreiter Künstler zeigt die Künstlerliste statt der Songs',
      (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', artist: 'Neoni', album: 'Roses');

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

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

    expect(find.text('Neoni'), findsOneWidget);
    // Unterreiter wechseln den Inhalt, sie öffnen keinen neuen Bildschirm —
    // Suchfeld und Reiter bleiben sichtbar.
    expect(find.text('Titel, Künstler und Alben suchen'), findsOneWidget);
    expect(find.text('Lieder'), findsOneWidget);
    expect(find.text('Shuffle-Wiedergabe'), findsNothing);

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

  testWidgets('Unterreiter Kategorie zeigt den Album-Titel als Kategorie',
      (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', artist: 'Neoni', album: 'Roses');

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

    // Das Album ist die Kategorie (siehe kategorienAusTags) — der Titel
    // taucht deshalb unter "Roses" auf.
    await db.setCategories('1', ['Roses']);
    await tester.tap(find.text('Kategorie'));
    await tester.pumpAndSettle();

    expect(find.text('Roses'), findsOneWidget);
    expect(find.text('1 Lieder'), findsOneWidget);
    expect(find.text('Titel, Künstler und Alben suchen'), findsOneWidget);
    expect(find.text('Lieder'), findsOneWidget);

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

  testWidgets('Titel ohne Kategorie sammeln sich unter "Ohne Kategorie"',
      (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();

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

    expect(find.text('Ohne Kategorie'), findsOneWidget);

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