Why you need to have tests

Almost all code needs maintenance. Sometimes it requires minor bug fixes, but other times it needs major changes or additions, or even a complete redesign. The more you change your code, the more likely you are to inadvertently introduce new problems or mistakes. What you need is a way to make sure you don't create new bugs when you fix the old ones and that everything still works when you redesign and refactor and improve your code. You need ways to verify that what used to work still works. You need tests.

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