def create(self, name):
        return self.assertResult(b"POST", b"/VolumeDriver.Create",
                                 {u"Name": name}, OK, {u"Err": u""})
application data is idempotent
dataset/ETHPy150Open ClusterHQ/flocker/flocker/dockerplugin/test/test_api.py/APITestsMixin.create--crossover with--dataset/ETHPy150Open enthought/traits/traits/etsconfig/tests/test_etsconfig.py/ETSConfigTestCase.test_application_data_is_idempotent