>I've seen situations where that big refactoring would involve scrapping or rewriting tests, and that causes its own kind of architectural conservatism. I call

>I've seen situations where that big refactoring would involve scrapping or rewriting tests, and that causes its own kind of architectural conservatism. I call this test concreting: https://hitchtest.readthedocs.org/en/latest/glossary/test_concreting.html https://hitchtest.readthedocs.org/en/latest/glossary/test_co... The way to avoid it is to either be damn sure that the API you've surrounded is tight, clean and unlikely to need to change much or to test at a higher level.