I stopped reading half way through his claim. TL;DR The guy doesn't understand how to test code and he doesn't understand test isolation. He responds to reques

I stopped reading half way through his claim. TL;DR The guy doesn't understand how to test code and he doesn't understand test isolation. He responds to requests to eat his vegtiables as "but I dont hafta" Unit tests are intended to test small mostly uncoupled parts of the code. (Usually scoped to single functions). Integration tests confirms the combination of functions, or the class in a context. Testing of user behavior is intended to be done in the functional tests, and only that. When you get to functional tests you should assume that most of the code is trustable underneath, as that the tests support that. The intention of the separation of the testing strategies means you don't have to do a ton of combination tests in a higher level (where the test is more expensive to run, write and maintain).