Regression testing is a type of software testing used to determine whether new problems are the result of software changes. Before applying a change, a program is tested. After a change is applied, the program is retested in selected areas to detect whether the change created new bugs or issues, or if the actual change achieved its intended purpose.
Regression testing ensures that any change in the source code or program doesn’t affect the existing features of the software application. It is basically selecting test cases that are fully or partially executed before. So, basically this ensures with every new change or introduction of new codes, the old code still works.
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