Regression testing is a software testing practice that ensures an application still functions as expected after any code changes, updates, or improvements.
Regression testing is responsible for the overall stability and functionality of the existing features. Whenever a new modification is added to the code, regression testing is applied to guarantee that after each update, the system stays sustainable under continuous improvements.
Changes in the code may involve dependencies, defects, or malfunctions. Regression testing targets to mitigate these risks, so that the previously developed and tested code remains operational after new changes.
Generally, an application goes through multiple tests before the changes are integrated into the main development branch. Regression testing is the final step, as it verifies the product behaviors as a whole.
Regression testing is applied under these circumstances:
- A new requirement is added to an existing feature
- A new feature or functionality is added
- The codebase is fixed to solve defects
- The source code is optimized to improve performance
- Patch fixes are added
- Changes in configuration
Tools for Regression Testing
Katalon Studio, Selenium, Watir ,IBM Rational Functional Tester, Apache JMeter