> Unit testing, leading to dependency injection, leading to IoC containers, leading to lots of tools to assemble, intercept and rewrite code at execution time.

> Unit testing, leading to dependency injection, leading to IoC containers, leading to lots of tools to assemble, intercept and rewrite code at execution time. it's funny since in theory TDD should reduce API surface as it is supposed to make people think about API before implementation. But then , TDD and DDD intersect and it's not much TDD anymore when the domain model has to be implemented...