diff --git a/tests/backends/base.py b/tests/backends/base.py
index 0d62554d..e76d7b08 100644
--- a/tests/backends/base.py
+++ b/tests/backends/base.py
@@ -7,6 +7,10 @@ from mopidy.models import Playlist, Track
 
 from tests import SkipTest
 
+__all__ = ['BaseCurrentPlaylistControllerTest',
+           'BasePlaybackControllerTest',
+           'BaseStoredPlaylistsControllerTest']
+
 def populate_playlist(func):
     def wrapper(self):
         for track in self.tracks: