'Test splitting of entity string.'

def test_split_entity_string(self):

    service.call_from_config(self.hass, {'service': 'test_domain.test_service', 'entity_id': 'hello.world,    sensor.beer'})
    self.hass.block_till_done()
    self.assertEqual(['hello.world', 'sensor.beer'], self.calls[(-1)].data.get('entity_id'))
