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Unit testing
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=== Allows for code refactoring === Unit testing allows the programmer to [[Refactoring|refactor]] code or upgrade system libraries at a later date, and make sure the module still works correctly (e.g., in [[regression testing]]). The procedure is to write test cases for all [[subroutine|function]]s and [[method (computer science)|method]]s so that whenever a change causes a fault, it can be identified quickly.
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