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A comment on Ask HN: Do you write tests before the implementation?. Parent comment

Re:Ask HN: Do you write tests before the implementation? by sdenton4 on Tuesday November 19, 2019 @09:49PM (#21580694)
No, alternate code path is exactly what I mean. What's the functionality I'm coding in support for today, in addition to the stuff I was supporting yesterday? How do I know the stuff from yesterday still works? TESTS!
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