Mutation testing: better code by making bugs

Do you test your code? What about your tests? Your tests are code, you need to write, refactor and maintain them. This is not cheap so how do you make sure you are testing enough but not too much? Discover Mutation Testing, a fun tool to make your code better by introducing bugs. -- The first part of the talk is about the costs of the tests to introduce what problem mutation testing is solving. The tests themselves are code, requires to be written and maintain and as such are far from being free. Depending of the maturity level of your application and your deadlines, you need to adjust the level of testing. Mutation testing is a technique that can provide a reliable metric to know how much of your code is actually tested (as opposed to unit test coverage which shows what code has *not* been tested) and as such provides a tool for both the team to control their level of tests and the business to have a trustworthy metric. The second part is about mutation testing itself: the theory, a demo of the PHP library Infection, pros/cons of that solution and the further development planned for this tool

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