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Kill the mutants – cause it is about time to test your tests Unit tests are part of our day today. Some of us are even practicing TDD. But we don't have a good measure of the quality of the tests. Tests are supposed to prove the correctness of the code, and together with CI, you also get registration for free. But the big question that we don't address is what is the quality of the test? If you are using Chaos Monkey then you are already familiar with the concept: Inject failures to your system and check the system robustness as well as the quality of your monitoring and alerts. Mutation Testing adopts the ‘Chaos Monkey’ methodology to the world of unit tests: Inject bugs to your code to see whether the test suite covers it. Or in other words, create mutations to the tested code and validate your tests can identify the mutations and kill them. Mutation Testing is not a new idea, but considered as too theoretical and was an academic thing. Noways that CPUs are faster and tools are better it is raising up again as a practical quality technique.Read less