Regression testing is a type of software testing that focuses on verifying that existing functionality still works as intended after code changes. These changes can include:
- Bug fixes
- New features
- Code refactoring
- Performance improvements
- Dependency updates The goal is to ensure that nothing that previously worked has been broken as a result of modifications.
Why Is It Important?
When you make a change to a software system, even a small one, it can have unintended side effects. Regression testing mitigates the risk of such issues by retesting previously tested components.
Key Characteristics
- Broad scope: Covers both affected and potentially unaffected areas.
- Repetitive: Often run repeatedly after each major change.
- Automated: Ideally part of the CD pipeline for speed and consistency.
- Risk-based: High-risk or business-critical areas often get prioritized.
Best Practices
- Automate frequently-run tests.
- Prioritize critical functionality and high-risk areas.
- Maintain a clean, updated test suite.
- Use version control to track test changes.
- Integrate with CI/CD pipelines.
- Monitor test coverage.