def test_created_is_listed(self):
        dataset_id = uuid4()
        new_volume = self.api.create_volume(
            dataset_id=dataset_id,
            size=self.minimum_allocatable_size)
        self.repeat_until_consistent(
            lambda: self.assertIn(new_volume, self.api.list_volumes()))
``create_volume`` returns a ``BlockDeviceVolume`` that is returned by
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/testtools/_blockdevice.py/IBlockDeviceAPITestsMixin.test_created_is_listed