1 files changed, 7 insertions, 0 deletions
diff --git a/player_mock.py b/player_mock.py
index 92da675..2fd343f 100644
--- a/player_mock.py
+++ b/player_mock.py
@@ -10,6 +10,7 @@ class Player():
         self.volume = 1.0
         self.currentSong = None
         self.playingStateChangedCallback = None
+        self.playbackVolumeChangedCallback = None
 
     def play(self):
         previousState = self.state
@@ -58,3 +59,9 @@ class Player():
     
     def simulatePlayingStateChanged(self):
         self.playingStateChangedCallback()
+
+    def setPlaybackVolumeChangedCallback(self, callback):
+        self.playbackVolumeChangedCallback = callback
+
+    def simulatePlaybackVolumeChanged(self):
+        self.playbackVolumeChangedCallback()