Explain difference between Smoke, Sanity and Regression Testing

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Smoke testing is a quick check to verify if the build is stable, Sanity testing is a subset of regression testing and Regression testing is to ensure that changes made to the code do not affect the existing functionality.

Smoke testing is done to check if the build is stable enough for further testing
Sanity testing is a subset of regression testing and is done to check if the bugs have been fixed and no new issues have been introduced
Regression testing is done to ensure that changes made to the code do not affect the existing functionality
Regression testing is done after every change in the code
Example: Smoke testing is done after a new build is received, Sanity testing is done after a bug fix and Regression testing is done after every change in the code

Explain difference between Smoke, Sanity and Regression Testing

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