Fix test_load_triggers_playing_of_new_playlist

mopidy/backends/__init__.py

@@ -39,6 +39,20 @@ class BaseCurrentPlaylistController(object):
     def load(self, playlist):
         self.playlist = playlist
 
+        playback = self.backend.playback
+
+        # FIXME introduce a mechanism for telling
+        # playback that it needs to reset
+        playback.playlist_position = 0
+
+        if playlist.tracks:
+            playback.current_track = playlist.tracks[0]
+        else:
+            playback.current_track = None
+
+        if playback.state == playback.PLAYING:
+            self.backend.playback.play()
+
     def move(self, start, end, to_position):
         tracks = self.playlist.tracks
 

tests/backends/__init__.py

@@ -84,7 +84,22 @@ class BaseCurrentPlaylistControllerTest(object):
         self.controller.load(Playlist())
         self.assertEqual(self.controller.version, version+1)
 
-    def test_load_triggers_playing_of_new_playlist(self):
+    @populate_playlist
+    def test_load_preserves_and_updates_play_state(self):
+        tracks = self.controller.playlist.tracks
+        playback = self.playback
+
+        self.playback.play()
+        self.controller.load(Playlist(tracks=[tracks[1]]))
+        self.assertEqual(playback.state, playback.PLAYING)
+        self.assertEqual(tracks[1], self.playback.current_track)
+
+        self.playback.stop()
+        self.controller.load(Playlist(tracks=[tracks[2]]))
+        self.assertEqual(playback.state, playback.STOPPED)
+        self.assertEqual(tracks[2], self.playback.current_track)
+
+    def test_load_triggers_playing_of_new_playlist_if_allready_playing(self):
         raise NotImplementedError
 
     @populate_playlist