what is Regression and Sanity testing? how and when you do it?

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Regression testing ensures that changes to the code do not affect existing functionality. Sanity testing checks if the critical functionalities are working after a small change.

Regression testing is done after making changes to the code to ensure that existing functionalities are not affected.
Sanity testing is done after a small change to ensure that critical functionalities are still working.
Regression testing is done after every major change, while sanity testing is done after every minor change.
Regression testing involves running the entire test suite, while sanity testing involves running only the critical test cases.
Regression testing is automated, while sanity testing can be manual or automated.

what is Regression and Sanity testing? how and when you do it?

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