Understanding the Different Types of Regression Testing

Regression testing is not a single technique but a collection of approaches applied based on the nature of changes in the application. Understanding the different types of regression testing helps teams choose the right strategy without over-testing or slowing down releases.

Corrective regression testing is used when existing functionality remains unchanged and test cases can be reused as-is. It is ideal for minor updates where no major code modifications are involved.
Progressive regression testing comes into play when new features are added, requiring new test cases while ensuring existing functionality still works as expected.
Selective regression testing focuses only on the parts of the system impacted by recent changes, helping reduce execution time while maintaining confidence.
Complete regression testing involves validating the entire application, typically after major refactoring, infrastructure changes, or large feature releases.
Unit regression testing ensures individual components remain stable after changes, while partial regression testing verifies how updated modules interact with existing ones.

Choosing the right type of regression testing depends on risk, release frequency, and system complexity. A well-structured strategy balances speed with coverage, especially in CI/CD-driven environments.