mpd: Use DummyMixer in tests

mopidy/mixer.py

@@ -2,6 +2,8 @@ from __future__ import absolute_import, unicode_literals
 
 import logging
 
+import pykka
+
 from mopidy import listener
 
 
@@ -147,3 +149,23 @@ class MixerListener(listener.Listener):
         :type mute: bool
         """
         pass
+
+
+class DummyMixer(pykka.ThreadingActor, Mixer):
+
+    def __init__(self):
+        super(DummyMixer, self).__init__()
+        self._volume = None
+        self._mute = None
+
+    def get_volume(self):
+        return self._volume
+
+    def set_volume(self, volume):
+        self._volume = volume
+
+    def get_mute(self):
+        return self._mute
+
+    def set_mute(self, mute):
+        self._mute = mute

tests/mpd/protocol/__init__.py

@@ -6,7 +6,7 @@ import mock
 
 import pykka
 
-from mopidy import core
+from mopidy import core, mixer
 from mopidy.backend import dummy
 from mopidy.mpd import session, uri_mapper
 
@@ -32,8 +32,10 @@ class BaseTestCase(unittest.TestCase):
         }
 
     def setUp(self):  # noqa: N802
+        self.mixer = mixer.DummyMixer.start().proxy()
         self.backend = dummy.create_dummy_backend_proxy()
-        self.core = core.Core.start(backends=[self.backend]).proxy()
+        self.core = core.Core.start(
+            mixer=self.mixer, backends=[self.backend]).proxy()
 
         self.uri_map = uri_mapper.MpdUriMapper(self.core)
         self.connection = MockConnection()

tests/mpd/test_status.py

@@ -4,7 +4,7 @@ import unittest
 
 import pykka
 
-from mopidy import core
+from mopidy import core, mixer
 from mopidy.backend import dummy
 from mopidy.core import PlaybackState
 from mopidy.models import Track
@@ -21,8 +21,10 @@ STOPPED = PlaybackState.STOPPED
 
 class StatusHandlerTest(unittest.TestCase):
     def setUp(self):  # noqa: N802
+        self.mixer = mixer.DummyMixer.start().proxy()
         self.backend = dummy.create_dummy_backend_proxy()
-        self.core = core.Core.start(backends=[self.backend]).proxy()
+        self.core = core.Core.start(
+            mixer=self.mixer, backends=[self.backend]).proxy()
         self.dispatcher = dispatcher.MpdDispatcher(core=self.core)
         self.context = self.dispatcher.context