def test_empty(self):
        deployment = Deployment(nodes=frozenset())
        expected = []
        self.assertEqual(expected, list(datasets_from_deployment(deployment)))
``datasets_from_deployment`` returns an empty list if no Manifestations
dataset/ETHPy150Open ClusterHQ/flocker/flocker/control/test/test_httpapi.py/DatasetsFromDeploymentTests.test_empty