In the realm of testing, the code coverage metrics is the most often talked about. However, it doesn’t mean that the test has been useful or that an assert has been coded.

I'll explain how Code Coverage is computed and what its inherent flaw is. Afterwards, I'll describe how Mutation Testing work and how it helps pointing out code that leaves out corner cases. I will also demo PIT, a Java production-grade framework that enables Mutation Testing.


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