Thanks for the feedback. The post only answers "Do we have a good safety net to change this legacy code?". Mutation testing is not a new concept. It's usually u

Thanks for the feedback. The post only answers "Do we have a good safety net to change this legacy code?". Mutation testing is not a new concept. It's usually used in critical systems: the system is mutated and you measure the time for detecting the mutation and the time for solving the problem.