diff --git a/mopidy/backends/__init__.py b/mopidy/backends/__init__.py
index bbb85598..44d82545 100644
--- a/mopidy/backends/__init__.py
+++ b/mopidy/backends/__init__.py
@@ -377,7 +377,7 @@ class BasePlaybackController(object):
         """
         The previous :class:`mopidy.models.Track` in the playlist.
 
-        For normal playback this is the next track in the playlist. If random
+        For normal playback this is the previous track in the playlist. If random
         and/or consume is enabled it should return the current track instead.
         """
         if self.repeat or self.consume or self.random:
@@ -386,11 +386,8 @@ class BasePlaybackController(object):
         if self.current_track is None or self.playlist_position == 0:
             return None
 
-        try:
-            return self.backend.current_playlist.playlist.tracks[
-                self.playlist_position - 1]
-        except IndexError:
-            return None
+        return self.backend.current_playlist.playlist.tracks[
+            self.playlist_position - 1]
 
     @property
     def state(self):
diff --git a/mopidy/backends/gstreamer.py b/mopidy/backends/gstreamer.py
index ffa72cc8..e39593af 100644
--- a/mopidy/backends/gstreamer.py
+++ b/mopidy/backends/gstreamer.py
@@ -3,11 +3,13 @@ gobject.threads_init()
 # FIXME make sure we don't get hit by
 # http://jameswestby.net/weblog/tech/14-caution-python-multiprocessing-and-glib-dont-mix.html
 
+import pygst
+pygst.require('0.10')
+
 import gst
 import logging
 import threading
 
-from mopidy.models import Track, Playlist
 from mopidy.backends import (BaseBackend,
                              BasePlaybackController,
                              BaseCurrentPlaylistController)
@@ -91,7 +93,7 @@ class GStreamerPlaybackController(BasePlaybackController):
         try:
             return self._bin.query_position(gst.FORMAT_TIME)[0] // gst.MSECOND
         except gst.QueryError, e:
-            logger.error('time_position failed: %s',e )
+            logger.error('time_position failed: %s', e)
             return 0
 
     def destroy(self):
diff --git a/tests/backends/gstreamer_test.py b/tests/backends/gstreamer_test.py
index 1836fb46..6672dd96 100644
--- a/tests/backends/gstreamer_test.py
+++ b/tests/backends/gstreamer_test.py
@@ -10,7 +10,7 @@ from tests.backends.base import (BasePlaybackControllerTest,
 folder = os.path.dirname(__file__)
 folder = os.path.join(folder, '..', 'data')
 folder = os.path.abspath(folder)
-song = os.path.join(folder, 'song%s.mp3')
+song = os.path.join(folder, 'song%s.wav')
 song = 'file://' + song
 
 # FIXME can be switched to generic test
@@ -24,3 +24,23 @@ class GStreamerPlaybackControllerTest(BasePlaybackControllerTest,
         unittest.TestCase):
     tracks = [Track(uri=song % i, id=i, length=4464) for i in range(1, 4)]
     backend_class = GStreamerBackend
+
+    def add_track(self, file):
+        uri = 'file://' + os.path.join(folder, file)
+        track = Track(uri=uri, id=1, length=4464)
+        self.backend.current_playlist.add(track)
+
+    def test_play_mp3(self):
+        self.add_track('blank.mp3')
+        self.playback.play()
+        self.assertEqual(self.playback.state, self.playback.PLAYING)
+
+    def test_play_ogg(self):
+        self.add_track('blank.ogg')
+        self.playback.play()
+        self.assertEqual(self.playback.state, self.playback.PLAYING)
+
+    def test_play_flac(self):
+        self.add_track('blank.flac')
+        self.playback.play()
+        self.assertEqual(self.playback.state, self.playback.PLAYING)