As the test system grows in size and the testers change, the management and maintenance of the huge test systems have become more and more difficult. Therefore the reverse engineering based on TTCN-3 test systems can help testers grasp the system design from higher levels, and can test the consistence between test design and test implementation, which is of great significance and important value for test system maintenance, expansion and evaluation. This thesis presents the reverse model recovery for the legacy code developed by TTCN-3. It can also help tester and maintainers to verify the test implement. Then the test system meta-model is designed. This thesis also introduced the technologies of the discovery of invocation model and data model based on the reverse model discovery system framework. Finally, the algorithms of extracting invocation model and partitioning data model are described.

The test configuration and data play an important role in a test system based on Web application. Test configuration is used to describe the number of test components in a test system based on Web application, and the connecting relationship between test components. Aimed at the comprehensibility, reusability and maintainability, the paper presents the test configuration models for the legacy code developed by TTCN-3 based on Web application. It can also help testers and maintainers to verify the test implement, etc. First, the paper introduces the algorithm to discovery the static test configuration model and its features based on TTCN-3 test systems. Then, the paper builds the algorithms to discover the dynamic test configuration models.

An execution system of distributed performance testing is designed in this paper, which provides a mechanism of node communication, test script deployment, test scheduling, execution-driving and test result collection in distributed environment. A workload model is established, by which testers can describe the performance testing requirement. A performance testing framework is given, which simulates user behaviors in real environment based on virtual users so as to generate workload from the system under test (SUT). It can control the execution of virtual users by TTCN-3 standard interface. After executing the performance testing, test report is generated by extracting log. A method of generating performance test-case is studied by reusing functional test scripts. By executing performance testing on an online bookstore, this paper demonstrates the availability of the method of reusing TTCN-3 functional test scripts and the capability of distributed performance testing system established.