Writing tests is not the greatest joy for most developers, especially when tests require lots of boilerplate code and are therefore difficult to understand and maintain. At Chrono24, we took Uncle Bob’s suggestion to write contra-variant tests [1] seriously. We have developed a testing framework that allows us to write tests that are easy to understand, don't cause refactoring problems, and are fun to write. In this talk, we will show how we have structured our tests to achieve this. We'll also explain the principles and tools you can use to do the same in your organization.