In times of CI/CD and continuous deployments, there is no way around automated testing to ensure the long-term quality of a C# application. Each developer is also responsible for testing. But automated testing isn't about quantity—it's about quality! So how do you ensure that your tests are effective and cover all important aspects? Mutation testing and fuzzing are two solutions here that can be used to automatically find potentially undiscovered errors in your software and/or weaknesses in existing unit tests. In this talk, Michael Contento will show you how to use mutation testing and fuzzing in C#. Armed with practical examples, you can then hunt down mutants independently and raise your software quality to a whole new level.