A beginner misconception about unit tests is that they exist to check the correctness of your code. That's what QA is for.
Tests allow you to assess the impact of any and all future changes to a codebase. They're an automated monitoring system.
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You'll write better tests if you write them with this in mind.
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Testing tip: I write tests that fail when we upgrade dependencies, which we have written
#HACKs for. This lets us review/remove the hack. - Show replies
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Regression testing is vital. You sleep better that way
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these two things are not exclusive
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in fact, the latter is a superset of the former
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