Regression testing is performed to verify that a code change executed in the software does not impact the existing functionality of the product. By regression testing you are making sure that the product works fine with new functionality, any bug fixes or changes with existing features. Previously executed test cases are re-executed in order to verify the impact of change has not adversely affected existing functionality.

OK, so I’ve decided to write something about regression testing, what it is, what it does, why and how do we do it. So as the song goes, “Let’s start at the very beginning”.

Regression testing is something that sounds so simple, so logical and an activity that should be obvious to what it entails. Yet time and time again, it is something that can cause problems for projects and software delivery. Usually in the time it takes to run the tests, inappropriate tests being used for regression or the very fact that there may be no regression suite to even execute.