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Concolic testing combines symbolic and concrete execution to generate test cases that achieve a good program coverage. Its benefits have been demonstrated for more than 15 years in the case of imperative programs. In this work, we present a concolic-based test generation tool for logic programs which exploits SMT-solving for constraint resolution.

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Concolic testing mixes symbolic and concrete execution to generate test cases covering paths effectively. Its benefits have been demonstrated for more than 15 years to test imperative programs. Other programming paradigms, like logic programming, have received less attention. In this paper, we present a concolic-based test generation method for logic programs. Our approach exploits SMT-solving for constraint resolution. We then describe the implementation of a concolic testing tool for Prolog and validate it on some selected benchmarks.