Regression testing

            During confirmation testing the defect got fixed and that part of the application started working as intended. But             there might be a possibility that the fix may have introduced or uncovered a different defect elsewhere in the             software. The way to detect these ‘unexpected side-effects’ of fixes is to do regression testing. The purpose of a             regression testing is to verify that modifications in the software or the environment have not caused any             unintended adverse side effects and that the system still meets its requirements. Regression testing are mostly             automated because in order to fix the defect the same test is carried out again and again and it will be very tedious to do it manually. Regression tests are executed whenever the software changes, either as a result of       fixes or new or changed functionality.