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> how can you possibly know what you built works (or still works when you change it for the 50th time) if you have no tests?

Because software development did exist before the invention of JUnit et al. The old fashioned way is 'user acceptance tests' and of course thats not perfect but its easily understandable, and nearly anyone can sit there and do it. And they might miss things or whatever yadda yadda but at the end of the day in an environment where everyone is short of time and time is money a bit of user testing can often be 'good enough'.






I’m not saying you need 100% code coverage, or 80%. Just some level of deliberate automation. In my personal experience, user testing as your only or primary form of testing gets painful fast.



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