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I'm not really sure why you think that this only applies to frameworks and libraries. In my eyes this applies to any unit tested code. It is really hard or near impossible to test tightly coupled code. Or do you disagree about testing code in general?

Also I don't really understand why you think that factories are an antipattern. As I see it factories play an important role when using dependency injection.

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High quality tightly coupled code tends to need less testing because it's tiny in comparison. I have seen plenty of cases where throw away code was less than 10 lines be replaced with 10-100x as much "reusable" code that without adding any end user related flexibility or improving performance in any way.

PS: I once wrote a 4 line hack in under 30 minutes for another team. They re-factored it into 12 classes over the course of a month and zero functionality was added. So, sure it was ugly and hard to write test cases for but they still put it into production to fix a major bug.

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