noun
the process of retesting a software application after changes have been made to ensure that the existing functionality still works correctly
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Regression testing is a crucial part of the software development process to ensure that new code changes do not negatively impact existing functionality.
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We need to run some regression testing before we can deploy the new update.
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Gotta do some regression testing before we push this out.
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Think of regression testing as a safety net for your code changes.