def test_no_state_changes(self):
        assert_application_calculated_changes(
            self, EMPTY_NODESTATE, to_node(EMPTY_NODESTATE), set(),
            no_change(),
        )
``ApplicationNodeDeployer.calculate_changes`` returns a
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/test/test_container.py/ApplicationNodeDeployerCalculateChangesTests.test_no_state_changes