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To assess the quality of test suites, mutation analysis seeds artificial defects (mutations) into programs; a nondetected mutation indicates a weakness in the test suite. We present an automated approach to generate unit tests that detect these mutations for object-oriented classes. This has two advantages: First, the resulting test suite is optimized towards finding defects modeled by mutation operators rather than covering code. Second, the state change caused by mutations induces oraclesdoi:10.1109/tse.2011.93 fatcat:sicmcdoi7zetbpr2llsgs7r5te