def test_starts_persistence_service(self):
        reactor = MemoryCoreReactor()
        self.script.main(reactor, self.options)
        self.assertTrue(self.data_path.isdir())
``ControlScript.main`` starts a configuration persistence service.
dataset/ETHPy150Open ClusterHQ/flocker/flocker/control/test/test_script.py/ControlScriptTests.test_starts_persistence_service