Test Generation Tool for Modified Condition/Decision Coverage: Model Based Testing

Model-Based Testing (MBT) approaches are becoming an attractive prospect for safety-critical software testing due to their efficiency and the flexibility. Requirements based testing and structural testing are used for safety-critical systems software assessment. Structural testing criteria such as Modified Condition/Decision Coverage (MC/DC) satisfaction are required by DO-178C standard. Existing tools and techniques use MC/DC coverage criterion on the code. We propose to use model-based testing that integrates several coverage criteria such as du-path and MC/DC to enhance testing efficiency. We propose an approach that starts with requirements modeled as an Extended Finite State Machine (EFSM) that will be transformed into graphs, we add special "coverage element" data structures that are integrated into the different models via graph labeling. The resulting transformation facilitates the traceability of testing information when moving from dataflow testing to control-flow testing and vice versa, therefore making the combination of both approaches efficient for specification structural testing. The process view and the architecture of a supporting tool are given as well as the steps needed to generate MC/DC test sequences.