Initial commit

test/library_db_test.dart

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+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:melo/library/database.dart';
+
+void main() {
+  late MeloDb db;
+  setUp(() => db = MeloDb(NativeDatabase.memory()));
+  tearDown(() => db.close());
+
+  SongsCompanion song(String id, String path, String title, {String? artist}) =>
+      SongsCompanion.insert(
+        id: id,
+        path: path,
+        title: title,
+        artist: Value(artist),
+        dateAddedMs: 1,
+        updatedAtMs: 1,
+      );
+
+  test('upsert + watchSongs sortiert nach Titel', () async {
+    await db.upsertSongs([song('1', '/a.mp3', 'Beta'), song('2', '/b.mp3', 'Alpha')]);
+    final songs = await db.watchSongs().first;
+    expect(songs.map((s) => s.title), ['Alpha', 'Beta']);
+  });
+
+  test('Re-upsert gleicher id erzeugt kein Duplikat, aktualisiert', () async {
+    await db.upsertSongs([song('1', '/a.mp3', 'Alt')]);
+    await db.upsertSongs([song('1', '/a.mp3', 'Neu')]);
+    final songs = await db.watchSongs().first;
+    expect(songs.length, 1);
+    expect(songs.first.title, 'Neu');
+  });
+
+  test('searchSongs findet über Titel und Künstler', () async {
+    await db.upsertSongs([
+      song('1', '/a.mp3', 'Nachtpuls', artist: 'Rotklang'),
+      song('2', '/b.mp3', 'Taglicht', artist: 'Beatzwei'),
+    ]);
+    expect((await db.searchSongs('nacht').first).length, 1);
+    expect((await db.searchSongs('rotklang').first).length, 1);
+    expect((await db.searchSongs('xyz').first).length, 0);
+  });
+
+  test('markMissing setzt Tombstone für fehlende Pfade', () async {
+    await db.upsertSongs([song('1', '/a.mp3', 'A'), song('2', '/b.mp3', 'B')]);
+    await db.markMissing(['/a.mp3'], 2); // /b.mp3 fehlt jetzt
+    final songs = await db.watchSongs().first;
+    expect(songs.map((s) => s.path), ['/a.mp3']);
+  });
+}

test/scan_test.dart

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+import 'dart:io';
+
+import 'package:drift/native.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:melo/library/database.dart';
+import 'package:melo/library/scan_service.dart';
+import 'package:path/path.dart' as p;
+
+void main() {
+  final fixtures = p.join(Directory.current.path, 'test', 'fixtures', 'audio');
+  late MeloDb db;
+  late Directory coverDir;
+
+  setUp(() async {
+    db = MeloDb(NativeDatabase.memory());
+    coverDir = await Directory.systemTemp.createTemp('melo_covers');
+  });
+  tearDown(() async {
+    await db.close();
+    await coverDir.delete(recursive: true);
+  });
+
+  test('scanFolders liest Tags aus den Test-mp3s', () async {
+    final count = await scanFolders(db, [fixtures], coverDir: coverDir);
+    expect(count, 3);
+    final songs = await db.watchSongs().first;
+    expect(
+      songs.map((s) => s.title).toSet(),
+      {'Nachtpuls', 'Taglicht', 'Herzschlag'},
+    );
+    final nacht = songs.firstWhere((s) => s.title == 'Nachtpuls');
+    expect(nacht.artist, 'Rotklang');
+    expect(nacht.album, 'Schwarz');
+    expect(nacht.durationMs, greaterThan(0));
+  });
+
+  test('extrahiert eingebettetes Cover als Datei', () async {
+    await scanFolders(db, [fixtures], coverDir: coverDir);
+    final songs = await db.watchSongs().first;
+    final withCover = songs.where((s) => s.coverPath != null).toList();
+    // Nur "Nachtpuls" hat ein eingebettetes Cover.
+    expect(withCover.length, 1);
+    expect(withCover.first.title, 'Nachtpuls');
+    expect(File(withCover.first.coverPath!).existsSync(), isTrue);
+  });
+
+  test('Re-Scan behält die UUID (sync-stabil)', () async {
+    await scanFolders(db, [fixtures], coverDir: coverDir);
+    final firstIds = {
+      for (final s in await db.watchSongs().first) s.path: s.id
+    };
+    await scanFolders(db, [fixtures], coverDir: coverDir);
+    final secondIds = {
+      for (final s in await db.watchSongs().first) s.path: s.id
+    };
+    expect(secondIds, firstIds);
+    expect((await db.watchSongs().first).length, 3); // keine Duplikate
+  });
+}