What is regression testing?
Regression testing verifies that code changes haven't broken existing functionality. When you're fixing bugs or adding features, regression tests ensure your application still works as intended. It's a core part of functional testing that helps maintain software quality.
Do you have any examples of regression testing?
Consider an e-commerce site where you've just added a new payment option. Regression testing would verify that existing payment methods and core shopping features still work correctly. Another common scenario is running smoke testing after a bug fix to ensure critical functions like user authentication remain stable.
Why is regression testing important?
Code changes can have unexpected ripple effects throughout an application. Regression testing catches these issues early, preventing defects from reaching production. It's especially critical in agile environments where frequent updates could potentially destabilize the system.
What are the challenges with regression testing?
The main challenges include maintaining test suites as applications grow and balancing thorough coverage with execution time. Test selection becomes crucial - you can't always run every test after each change. Many teams address this through automation and intelligent prioritization of high-risk areas.
