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It's much easier to convince people that tests are necessary if you're starting a new project. Problems arise when you're working on a legacy codebase that never had tests to begin with. Often, the code isn't testable at all.

IME, there are far too many "senior" devs (who absolutely should know better) who never worked on any testing-heavy teams that just don't see the point. After all, there's QA, and it's not like THIS code should break THAT code in a seemingly-unrelated part of the codebase...

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