Model-based testing of concurrent programs with predicate sequencing constraints

A predicate sequencing constraint logic (PSCL) is proposed to represent test purpose for testing of concurrent programs. The advantage of PSCL rests in its capability of expressing not only sequencing relationships among I/O events, but also data dependencies between event parameters. A PSCL-based symbolic test case generation method is also proposed to automatically derive symbolic test cases that incorporate given data dependency constraints as verdict conditions. The method works in a syntactic way without referring to concrete program states and the derived test cases allow for dynamic test data selection according to the response from, the software under test. A case study shows the PSCL-based test case generation can achieve transition coverage with smaller number of test steps.