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Re:Zen and the Art of Unit Testing by adamkl on Wednesday March 15, 2017 @10:10AM (#13876186)
Take a look at Gary Bernhardt's talk "Boundaries"[1]. It touches on this very topic and was quite the eye-opener for me (having experienced all the same issues you've described).

[1]https://www.destroyallsoftware.com/talks/boundaries

Re:Zen and the Art of Unit Testing by lubonay on Wednesday March 15, 2017 @11:49AM (#13876918)
I think this may hit the nail on the head, gonna check it out later. Thanks!