We all know good unit tests are important, but why can they be so hard to write and maintain? It's the architecture. Mixing your business logic with infrastructure aspects forces your tests to be more complex.

A solution is the Testable Architecture combined with patterns from Domain-Driven Design. Combining Hexagonal and Clean Architecture concepts, this architecture helps make it clear how to organize your code into easily testable chunks, and scales from the smallest microservice to large, well-structured monoliths.

Through a mix of diagrams and real-world Java code, you’ll learn the Testable Architecture and understand how it makes testing easier and results in more readable code.