Never in the field of software development was so much owed by so many to so few lines of code.
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All code is tested.
During development, the first thing we do is run our own programmer’s “acceptance test.” We code, compile, and run. When we run, we test. The test may just be clicking a button to see if it brings up the expected menu. Nevertheless, every day, we code, we compile, we run, and we test.
When we test, we often find issues—especially on the first run. Therefore, we code, compile, run, and test again.
Most of us quickly develop a pattern for our informal tests: we add a record, view a record, edit ...