Europe’s Official Laravel Conference https://laracon.eu No one wants to ship bugs. To prevent that, and to improve the quality of our work we write tests, hopefully covering every aspect of the feature. However, line coverage reports are misleading. Let's take a look at what Mutation Testing is and how it could fit in your workflow to improve the quality of your tests. Applying Mutation Testing will increase your test coverage, but the most important thing is that it will improve your confidence in your tests.