Noun
regression testing (uncountable)
(software engineering) Testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions.
Regression testing is typically the largest test effort in commercial software development, Paul Ammann; Jeff Offutt (2008). Source: Internet
Regression testing is a type of software testing that verifies that software previously developed and tested still performs correctly after it was changed or interfaced with other software. Source: Internet
Regression testing can be performed to test a system efficiently by systematically selecting the appropriate minimum set of tests needed to adequately cover a particular change. Source: Internet