Regression testing
Regression testing is a type of software testing that ensures new changes, updates, or enhancements to an application do not introduce bugs or negatively impact existing functionality. It is performed after modifications such as code changes, patches, or integrations to verify that previously tested features still work as expected.
This testing is essential because software systems evolve constantly, and even small updates can unintentionally disrupt critical workflows. Regression testing provides confidence in software stability, reduces risk of production errors, and helps maintain quality over time.
Advanced
Regression testing can be manual or automated, depending on project scale and complexity. Automated regression testing is widely adopted because it allows test cases to be re-executed quickly and consistently whenever code changes occur. Tools such as Selenium, JUnit, and TestNG are often used to build and run regression test suites.
Advanced approaches include selective regression testing, where only affected modules are tested, and continuous regression testing, which integrates with CI/CD pipelines for ongoing quality assurance. Test coverage, prioritization, and version control of test cases are key aspects of maintaining an effective regression testing strategy.
Relevance
Applications
Metrics
Issues
Example
An online retailer introduced a new recommendation engine on its website. To ensure the new feature did not disrupt checkout or payment processes, the QA team ran automated regression tests. The testing confirmed core functions worked correctly, allowing a smooth rollout that improved customer engagement without affecting sales performance.