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Regression testing is applied to code immediately after changes are made. • The goal is to assure that the changes have not had unintended consequences. – ZtoT, a new service, is added that inputs a country and a zip code and return the time-zone. CSE 4321/5321, Ali Sharifara, UTA. Page 12. Example (2). Why is regression testing a problem? • Large systems can take a long time to retest. • e.g., 6 months of regression testing before every release. SUMMARY Regression testing is a testing activity that is performed to provide For example, when the new version is written in a different programming