What's the difference between Regression, Sanity and Smoke. which testing you will do when

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Accepted Answer

Regression, Sanity, and Smoke testing are different types of testing performed at different stages of the software development lifecycle.

Regression testing is performed to ensure that new code changes have not adversely affected existing functionality.
Sanity testing is a subset of regression testing and is performed to quickly determine if a new build is stable enough for more rigorous testing.
Smoke testing is performed to check if the critical functionalities of the software are working fine before proceeding with further testing.
Regression testing is done after code changes, sanity testing is done after minor changes, and smoke testing is done before more comprehensive testing.
Example: After a new feature is added to a software application, regression testing would be performed to ensure that existing features still work as expected.

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