Regression Testing

What is Regression Testing?

Regression testing re-runs existing test cases after code changes, fixes, or enhancements to ensure that new changes haven't broken previously working functionality.

When Regression Testing is Performed

• After a bug fix, to ensure the fix hasn't introduced new issues elsewhere.
• After adding a new feature, to confirm existing features still work.
• After configuration or environment changes.

Approaches to Regression Testing

• Complete Regression: Re-running the entire test suite.
• Partial Regression: Re-running tests related to the changed area and its dependencies.
• Automated Regression: Using automation tools to run regression suites quickly and repeatedly.