diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/collection.py b/tests/collection.py
new file mode 100644
index 0000000..e857fff
--- /dev/null
+++ b/tests/collection.py
@@ -0,0 +1,56 @@
+import unittest
+
+import music_kraken
+from music_kraken.objects import Song, Album, Artist, Collection
+
+class TestCollection(unittest.TestCase):
+    def test_song_album_relation(self):
+        """
+        Tests that
+        album = album.any_song.one_album
+        is the same object
+        """
+
+        artist: Artist = Artist(
+            name="artist",
+            main_album_list=[
+                Album(
+                    title="album",
+                    song_list=[
+                        Song(
+                            title="song",
+                            album_list=[
+                                Album(title="album", albumsort=123),
+                            ],
+                        ),
+                        Song(
+                            title="other_song",
+                            album_list=[
+                                Album(title="album", albumsort=423),
+                            ],
+                        ),
+                    ]
+                ),
+                Album(title="album", barcode="1234567890123"),
+            ]
+        )
+
+        a = artist.main_album_collection[0]
+        b = a.song_collection[0].album_collection[0]
+        c = a.song_collection[1].album_collection[0]
+        d = b.song_collection[0].album_collection[0]
+        e = d.song_collection[0].album_collection[0]
+        f = e.song_collection[0].album_collection[0]
+        g = f.song_collection[0].album_collection[0]
+
+        self.assertTrue(a.id == b.id == c.id == d.id == e.id == f.id == g.id)
+        self.assertTrue(a.title == b.title == c.title == d.title == e.title == f.title == g.title == "album")
+        self.assertTrue(a.barcode == b.barcode == c.barcode == d.barcode == e.barcode == f.barcode == g.barcode == "1234567890123")
+        self.assertTrue(a.albumsort == b.albumsort == c.albumsort == d.albumsort == e.albumsort == f.albumsort == g.albumsort == 123)
+
+        d.title = "new_title"
+
+        self.assertTrue(a.title == b.title == c.title == d.title == e.title == f.title == g.title == "new_title")
+
+if __name__ == "__main__":
+    unittest.main()