Abstract: Web Service is a standardsbased architecture and XMLbased messaging technology. The language and platformindependence characteristics bring difficulties on testing. For the diverse possibilities of languages and platforms of Web Service, an efficient mapping approach for Web Service ATU with TTCN3 is proposed, which can accommodate all varieties of client types. This paper designs an algorithm for the automated generation of the ATU. In addition, this paper presents the process of the test approach via a test case, illustrates that specifying test suites at an abstract level in TTCN3. The test suites are language and platformindependent and can be reused by diverse types of clients.

Key words: Web Service testing, TTCN3, abstract test suite, system under test adapter, codec