Life on an untested software project is hardly worth living. Programmers are always scared that disaster will strike. They don’t feel confident in their product, and they are correct in their lack of confidence. Without through testing, there is no reason to be sure that their software is working correctly.
After testing is implemented, everything changes. Programmers can sleep easy. Although bugs may still leak through the test process, at least all the easy bugs are caught/ And as new bugs are encountered, the tests are improved. Over time, the test suite becomes quite skilled at catching bugs.
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