What’s more, when verdict on any step of interoperation is fail, considering the dependency relation among APIs, the execution of test case should be terminated immediately, which shows some bugs in called API for interoperation. When all verdicts of interoperation in interoperability testing scenario are pass, it means that this kind of API calling relation can meet the requirements of software interoperation in these APIs. As the API caller and the called API exist asymmetric during interoperation, so it is necessary to exchange the role of two operating systems in this combination before another interoperability testing.