Unit Testing, test driven development, stress testing, load testing, live testing (I made that up) - one way or another we all test our code. Usually we leave it to the user and deal with it later. This is unfair on the user and unprofessional.
Engineer your tests, make them interesting to write, get in to the practice of writing tests as a matter of course. Get setup at the beginning and updates as you go along a small bit of pain today will save you from the headaches tomorrow.
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