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Fuzzing (or Fuzz Testing) is a technique to verify the robustness of a program-under-test. Valid input is replaced by random values with the goal to force the program-under-test into unresponsive states. In this position paper, we propose a white box Fuzzing approach by transforming (mutating) existing test methods. We adopt the mechanisms used for test amplification to generate crash inducing tests, which developers can reproduce later. We provide anecdotal evidence that our approach towards Fuzzing reveals crashing issues in the Pharo environment.