juniorUnit Testing
What is regression testing?
Updated May 6, 2026
Short answer
Regression testing ensures new changes don't break existing functionality.
Deep explanation
It involves re-running existing tests after code changes. It ensures stability of previously working features.
Real-world example
Testing checkout flow after adding discount feature.
Common mistakes
- Skipping regression tests after minor changes.
Follow-up questions
- When should regression testing be done?
- Is automation useful here?