Refactoring for TTCN-3 Test Suites Benjamin Zeiss 1, Helmut Neukirchen 1, Jens Grabowski 1,

Abstract. Experience with the development and maintenance of test suites has shown that the Testing and Test Control Notation (TTCN-3) provides very good concepts for adequate test specification. However, experience has also demonstrated that during either the migration of legacy test suites to TTCN-3, or the development of large TTCN-3 test specifications, users have found it is difficult to construct TTCN-3 tests that are concise with respect to readability, usability, and maintainability. To address these issues, this paper investigates refactoring for TTCN-3; systematically restructuring a test suite without changing its behaviour. Complementary metrics are suggested to assess the readability and maintainability of TTCN-3 test suites. For automation, a tool called TRex has been developed that supports refactoring and metrics for TTCN-3.