def test_set_volume_calls_player(self):
rbplayer = RBHandler(self.shell)
rbplayer.set_volume(2.0)
self.player.set_volume.assert_called_with(2.0)
def test_set_volume_with_invalid_value_fails(self):
rbplayer = RBHandler(self.shell)
with self.assertRaises(Exception):
rbplayer.set_volume("myvolume")
