I would have a repository layer even if I wouldn't write any tests. I don't want an ORM to interfere with my "business". So this could as well be a post agains

I would have a repository layer even if I wouldn't write any tests. I don't want an ORM to interfere with my "business". So this could as well be a post against ORMs. But still I think author is right. TDD does enforce an architecture, and that architecture doesn't have to be the best. TDD zealots often run around, preaching their cult and blind out any drawbacks, as if there were none.