'Test volume level property w/ children and attrs.'

def test_volume_level_children_and_attr(self):

    config = self.config_children_and_attr
    universal.validate_config(config)
    ump = universal.UniversalMediaPlayer(self.hass, **config)
    self.assertEqual('0', ump.volume_level)
    self.hass.states.set(self.mock_volume_id, 100)
    self.assertEqual('100', ump.volume_level)
