I think you are mixing a few roles and pushing the views on development alone

Unit Tests are meant for developers are good at what they claim as done, infact, would say, they have not missed the funds of customers as professtionals.

Code Coverage is Managment measurable madness to enforce Unit Tests. But the real intent of Unit Tests is to make Developers more productive and waste less in debugging or use less of memory to fix confidently any bug.

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