Checking whether changes to software have broken functionality that used to work
This article is about software development. For the statistical analysis process, see Regression analysis.
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Regression testing (rarely, non-regression testing[1]) is re-running functional and non-functional tests to ensure that previously developed and tested software still performs as expected after a change.[2] If not, that would be called a regression.
Changes that may require regression testing include bug fixes, software enhancements, configuration changes, and even substitution of electronic components (hardware).[3] As regression test suites tend to grow with each found defect, test automation is frequently involved. The evident exception is the GUIs regression testing, which normally must be executed manually. Sometimes a change impact analysis is performed to determine an appropriate subset of tests (non-regression analysis[4]).
^Pezzè, Mauro; Young, Michal (2008). Software testing and analysis: process, principles, and techniques. Wiley. Testing activities that focus on regression problems are called (non) regression testing. Usually "non" is omitted
^Basu, Anirban (2015). Software Quality Assurance, Testing and Metrics. PHI Learning. ISBN 978-81-203-5068-7.
^National Research Council Committee on Aging Avionics in Military Aircraft: Aging Avionics in Military Aircraft. The National Academies Press, 2001, page 2: ″Each technology-refresh cycle requires regression testing.″
^Boulanger, Jean-Louis (2015). CENELEC 50128 and IEC 62279 Standards. Wiley. ISBN 978-1119122487.
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