[lucasyvas]

I understand what the article is arguing. I agree with it, but think it's idealistic. If swaths of your code are a mess, integration testing is super painful. You can't easily add it until you clean up the mess, so the other forms of testing are more practical more often in my experience. If you get to a point where your code isn't a mess, I'd agree that you should start introducing meaningful integration tests.

I think this is just one of those cases where there is a context-sensitive strategy to testing. It depends completely on the cleanliness of your code and experience working with it.