mutmut - python mutation tester Mutmut is a mutation testing system for Python, with a strong focus on ease of use. If you don't know what mutation testing is try starting with this article. Some highlight features: Found mutants can be applied on disk with a simple command making it very easy to work with the results Remembers work that has been done, so you can work incrementally Knows which tests to execute, speeding up mutation testing Interactive terminal based UI Parallel and fast executio...