I think one of the most frustrating outcomes for all parties involved in a software release is when a release breaks something that was previously working.
With the latest release of Toad for Oracle you can quickly and easily add and save tests while you work on your PL/SQL code.
The Code Tester repository is a schema residing on the same Oracle instance as the objects you are testing, so when you backup your database instance the related tests are also backed up. They can also be added to version control system so the correct version of the tests are saved with the corresponding version of the PL/SQL object.
For more help check out this quick video on how to add regression testing of PL/SQL code:http://www.quest.com/video/add-regression-testing-of-plsql-code-to-your-daily-routine-with-toad-for-oracle8129571