'Test source property w/ children and attrs.'

def test_source_children_and_attr(self):

    config = self.config_children_and_attr
    universal.validate_config(config)
    ump = universal.UniversalMediaPlayer(self.hass, **config)
    self.assertEqual('dvd', ump.source)
    self.hass.states.set(self.mock_source_id, 'htpc')
    self.assertEqual('htpc', ump.source)
