Discover advanced unit testing techniques in this comprehensive conference talk. Learn how to create maintainable, expressive, and efficient test code that enhances your development process. Explore testing priorities, avoid common pitfalls, and master JUnit 5 exception testing. Understand the shared @Before nexus, guidelines for breaking unit tests, and crafting clear failure messages. Delve into the differences between Stubs and Mocks, and gain insights on improving code testability and readability. Uncover the concept of the 'circle of purity' to isolate critical logic effectively. Enhance your unit testing skills and boost your development productivity through this engaging and informative session.