Regression Testing

For example, imagine a marketing automation platform that integrates with a CRM system to enrich customer data and trigger personalized email campaigns. When developers add a new feature that allows segmentation based on website behavior, regression testing becomes essential. The QA team would run tests to verify that existing functionalities—such as lead scoring, contact record updates, and scheduled email deliveries—continue to work properly. They might discover that the new code inadvertently altered how certain customer attributes are processed, causing some contacts to be incorrectly categorized. By catching and fixing this issue before deployment, the team prevents a scenario where marketing campaigns target the wrong audience segments, which could damage customer relationships and reduce campaign effectiveness. This systematic verification ensures that every enhancement builds upon a stable foundation rather than introducing new problems.