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'''Regression testing''' (rarely, ''non-regression testing''<ref>{{cite book |last1=Pezzè |first1=Mauro |last2=Young |first2=Michal |title=Software testing and analysis: process, principles, and techniques |date=2008 |publisher=Wiley |url=https://www.google.com/search?q=Mauro+%22non-regression%22+%22regression+testing%22 |quote=Testing activities that focus on regression problems are called (non) regression testing. Usually "non" is omitted}}</ref>) is re-running [[functional testing|functional]] and [[non-functional testing|non-functional tests]] to ensure that previously developed and tested software still performs as expected after a change.<ref>{{cite book|last=Basu|first=Anirban| title=Software Quality Assurance, Testing and Metrics| year=2015| publisher=PHI Learning| isbn=978-81-203-5068-7| url=https://books.google.com/books?id=aNTiCQAAQBAJ&pg=PA150}}</ref> If not, that would be called a ''[[software regression|regression]]''.
Changes that may require regression testing include [[software bug|bug]] fixes, software enhancements, [[configuration file|configuration]] changes, and even substitution of [[electronic component]]s ([[Computer hardware|hardware]]).<ref>[[National Academies of Sciences, Engineering, and Medicine|National Research Council]] Committee on Aging Avionics in Military Aircraft: [https://www.nap.edu/catalog/10108/aging-avionics-in-military-aircraft ''Aging Avionics in Military Aircraft'']. The National Academies Press, 2001, page 2: ″Each technology-refresh cycle requires regression testing.″</ref> As regression [[test
==Background==
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