The entire industry approves of unit testing but almost no one can fully agree on how to do it correctly, or even on what unit tests are. This results in unit tests often being associated with slower development cycle and an overall less enjoyable workflow. I'll show you how testing turns into hell in real enterprises with the most common anti-patterns and then I'll show you that most of them are avoidable with modern tooling like mutation testing, snapshot testing, dirty-equals, and many more. We'll discuss how to make tests speed up your development and make refactoring easy.

API versioning is tough, really tough. We tried multiple approaches to versioning in production and eventually ended up with a solution we love. During this talk you will look into the tradeoffs of the most popular ways to do API versioning, and I will recommend which ones are fit for which products and companies. I will also present my framework, Cadwyn, that allows you to support hundreds of API versions with ease -- based on FastAPI and inspired by Stripe's approach to API versioning.

After this session, you will understand which approach to pick for your company to make your versioning cost effective and maintainable without investing too much into it.