Corrections, modifications and extensions are bound to occur even for small programs and testing is required every time there is a change. Testing during maintenance is termed regression testing. The test set, the test plan, and the test results for the original program should exist.
Modifications must be made to accommodate the program changes, and then all portions of the program affected by the modifications must be re-tested. After regression testing is complete, the program and test documentation must be updated to reflect the changes.
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