fixed tests, they pass now

src/music_kraken/objects/metadata.py

@@ -275,7 +275,7 @@ class Metadata:
     # the key is an enum from Mapping
     # the value is a list with each value
     # the mutagen object for each frame will be generated dynamically
-    id3_dict: Dict[any, list]
+    id3_dict: Dict[Mapping, list]
 
     def __init__(self, id3_dict: Dict[any, list] = None) -> None:
         self.id3_dict = dict()

src/music_kraken/objects/song.py

@@ -131,7 +131,7 @@ class Song(MainObject):
             id3Mapping.TRACKNUMBER: [self.tracksort_str]
         })
 
-        metadata.merge_many([s.get_song_metadata() for s in self.source_collection])
+        metadata.merge_many([s.metadata for s in self.source_collection])
         metadata.merge_many([a.metadata for a in self.album_collection])
         metadata.merge_many([a.metadata for a in self.main_artist_collection])
         metadata.merge_many([a.metadata for a in self.feature_artist_collection])
@@ -185,7 +185,10 @@ class Song(MainObject):
         if the album tracklist is empty, it sets it length to 1, this song has to be on the Album
         :returns id3_tracksort: {song_position}/{album.length_of_tracklist} 
         """
-        return f"{self.tracksort}/{len(self.album.tracklist) or 1}"
+        if len(self.album_collection) == 0:
+            return f"{self.tracksort}"
+        
+        return f"{self.tracksort}/{len(self.album_collection[0].tracklist) or 1}"
 
 
 """