fixed unit tests

lib/injection_container.dart

@@ -30,6 +30,7 @@ Future<void> setupGetIt() async {
       final musicDataStore = MusicDataStore(
         musicDataRepository: getIt(),
       );
+      musicDataStore.init();
       return musicDataStore;
     },
   );

lib/presentation/state/music_data_store.dart

@@ -14,14 +14,12 @@ class MusicDataStore extends _MusicDataStore with _$MusicDataStore {
 }
 
 abstract class _MusicDataStore with Store {
-  _MusicDataStore(this._musicDataRepository) {
-    fetchArtists();
-    fetchAlbums();
-    fetchSongs();
-  }
+  _MusicDataStore(this._musicDataRepository);
 
   final MusicDataRepository _musicDataRepository;
 
+  bool _initialized = false;
+
   @observable
   ObservableList<Artist> artists = <Artist>[].asObservable();
   @observable
@@ -43,6 +41,15 @@ abstract class _MusicDataStore with Store {
   @observable
   ObservableList<Song> albumSongs = <Song>[].asObservable();
 
+  void init() {
+    if (!_initialized) {
+      fetchArtists();
+      fetchAlbums();
+      fetchSongs();
+    }
+    _initialized = true;
+  }
+
   @action
   Future<void> updateDatabase() async {
     isUpdatingDatabase = true;

test/system/models/song_model_test.dart

@@ -79,17 +79,17 @@ void main() {
       'should return valid MediaItem',
       () async {
         // arrange
-        const expected = MediaItem(
+        final expected = MediaItem(
             id: PATH_3,
             title: SONG_TITLE_3,
             album: ALBUM_TITLE_3,
             artist: ARTIST_3,
-            duration: Duration(milliseconds: DURATION_3),
+            duration: const Duration(milliseconds: DURATION_3),
             artUri: 'file://$ALBUM_ART_PATH_3',
             extras: {
               'albumId': ALBUM_ID_3,
+              'blocked': BLOCKED_3.toString(),
               'trackNumber': TRACKNUMBER_3,
-              'blocked': BLOCKED_3
             });
 
         const songModel = SongModel(