Gstreamer tests: use fakesink for audio output

mopidy/backends/gstreamer.py

@@ -61,6 +61,12 @@ class GStreamerPlaybackController(BasePlaybackController):
 
         self.stop()
 
+    def use_fake_sink(self):
+        """For testing. To avoid audio output during testing, and the need for
+        a sound card and a fully working gstreamer installation."""
+        sink = gst.element_factory_make("fakesink", "fakesink")
+        self._bin.set_property("audio-sink", sink)
+
     def _set_state(self, state):
         self._bin.set_state(state)
 

tests/backends/gstreamer_test.py

@@ -28,6 +28,10 @@ class GStreamerPlaybackControllerTest(BasePlaybackControllerTest,
         for i in range(1, 4)]
     backend_class = GStreamerBackend
 
+    def setUp(self):
+        super(GStreamerPlaybackControllerTest, self).setUp()
+        self.backend.playback.use_fake_sink()
+
     def add_track(self, path):
         uri = path_to_uri(data_folder(path))
         track = Track(uri=uri, id=1, length=4464)