What is Regression Testing

Definition: Regression testing refers to a type of software testing that is used to verify any modification or update in a software without affecting the overall working functionality of the said software.

Description: Regression testing is performed when there is a code change in a software application. This change in the code needs validation before it is made live. Regression testing ensures that the change in the code does not bring up bugs in the workings of the software. Once the regression testing is cleared, functionality testing of the build starts. In case regression testing brings up critical issues, then in most cases, functionality testing is halted. As a checklist, we should create a regression testcase suite the first time an application is made live. The coverage of this list would typically contain all the core testcases which are critical to the working of the application. Regression suite is a work-in-progress document and should be updated for any new production push if any critical change is added to the application. Basic advantage of regression testing is that it ensures that the build is stable, with the core functionality working as expected. The tester can also concentrate more on testing of the new functionality which increases the productivity of the tester. In case the process is mature, the regression testing suite should be automated, which will help save time and cuts down on maintenance costs as well.