Are you tired of trivial TDD examples like FizzBuzz? I am. So let's look at a real-world problem to see how Test-Driven Development (TDD) helps us think is small pieces, build provable code, and reduce the amount of unneeded code that creeps into our applications. In the real world, we have to deal with services, libraries, and dependencies. And we have to deal with strange bugs that crop up. In this session, we'll go beyond the simple examples and learn how to break down complexity, isolate dependencies with mocking, and capture expected exceptions.