'Test is volume muted property w/ children and attrs.'

def test_is_volume_muted_children_and_attr(self):

    config = self.config_children_and_attr
    universal.validate_config(config)
    ump = universal.UniversalMediaPlayer(self.hass, **config)
    self.assertFalse(ump.is_volume_muted)
    self.hass.states.set(self.mock_mute_switch_id, STATE_ON)
    self.assertTrue(ump.is_volume_muted)
