Regression testing and sanity difference

Question

Accepted Answer

Regression testing is retesting of previously tested functionality, while sanity testing is a quick check to ensure basic functionality is working.

Regression testing is performed to ensure that changes or fixes in the software do not introduce new defects or impact existing functionality.
It involves retesting of the entire application or a specific set of test cases.
Regression testing is usually performed after major changes or enhancements to the software.
Sanity testing is a subset of regression testing and focuses on quickly checking if the basic functionality of the software is working as expected.
It is a cursory testing to determine if further testing is needed.
Sanity testing is performed before regression testing to save time and effort.
For example, after fixing a bug in an e-commerce website, regression testing would involve testing the entire website to ensure the fix did not introduce new issues. Sanity testing, on the other hand, would involve quickly checking if the login, search, and add to cart functionalities are working after the fix.

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