diff --git a/tests/test_collection.py b/tests/test_collection.py
index 7a9e3ca..12fe2f2 100644
--- a/tests/test_collection.py
+++ b/tests/test_collection.py
@@ -111,8 +111,7 @@ class TestCollection(unittest.TestCase):
 
         album_1.merge(album_2)
 
-        self.assertTrue(id(album_1.artist_collection) == id(album_1.artist_collection))
-        self.assertTrue(id(album_1.song_collection[0].main_artist_collection) == id(album_1.song_collection[0].main_artist_collection))
+        self.assertTrue(id(album_1.artist_collection) == id(album_1.artist_collection) == id(album_1.song_collection[0].main_artist_collection) == id(album_1.song_collection[0].main_artist_collection))
 
     def test_song_artist_relations(self):
         a = self.complicated_object()