Code without use case tests that are solid, fast, and cover all use cases. I am happy to work with any code written in any style as long as the tests are solid.

Code without use case tests that are solid, fast, and cover all use cases. I am happy to work with any code written in any style as long as the tests are solid. Tests done well are basically a machine checkable specification of what the software is supposed to do. It allows you to jump in and make large changes without breaking anything. I am maintaining a very large system written in C++ and I routinely refactor and make system wide changes without fear. I haven’t had a bug in production for 5+ years. Imagine how productive you will be when you never have to spend time fixing urgent production bugs.