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We elaborate on a metamorphic approach for testing industrial controlsystems. The proposed approach consists of two phases: an exploration phase inwhich we learn about fault patterns of the system under test and anexploitation phase where the observed fault patterns are used for targetedtesting. Our method extracts metamorphic relations and input space of thesystem from its requirements. The seed input used for testing is extracted fromthe execution logs of the system and used to generate source tests andfollow-up tests automatically. The morphed input is constructed based on theseed input and refined using a set of constraints. The approach is exemplifiedon a position control system and the results show that it is effective indiscovering faults with an increased level of automation.

A Two-phase Metamorphic Approach for Testing Industrial Control Systems