Add rename and rename tests

mopidy/backends/gstreamer.py

@@ -112,3 +112,11 @@ class GStreamerStoredPlaylistsController(BaseStoredPlaylistsController):
     def delete(self, playlist):
         if playlist in self._playlists:
             self._playlists.remove(playlist)
+
+    def rename(self, playlist, name):
+        if playlist not in self._playlists:
+            return
+
+        renamed = playlist.with_(name=name)
+        index = self._playlists.index(playlist)
+        self._playlists[index] = renamed

tests/backends/base.py

@@ -940,3 +940,11 @@ class BaseStoredPlaylistsControllerTest(object):
 
     def test_refresh(self):
         raise SkipTest
+
+    def test_rename(self):
+        playlist = self.stored.create('test')
+        self.stored.rename(playlist, 'test2')
+        self.stored.get(name='test2')
+
+    def test_rename_unknown_playlist(self):
+        self.stored.rename(Playlist(), 'test2')