Michael Kuehne - TDD for APIs It is always tough to test a complex API comprehensively. The additional level of complexity brings us to the question "How can we validate that our API is working as intended?" In this talk I will explain how to use test driven development for APIs to solve this problem and even further how TDD can drive an API Design towards a more usable design. I will outline my practical approach with an implementation example based on django. And finally I will give you a brief summary of my lessons learned using this approach in customer projects.