Regression vs sanity vs smoke

Question

Accepted Answer

Regression, sanity, and smoke testing are different types of software testing used in QA.

Regression testing is used to ensure that new code changes do not negatively impact existing functionality.
Sanity testing is a narrow and focused testing to quickly determine if the new functionality is working as expected.
Smoke testing is a preliminary testing to check if the critical functionalities of the software are working fine.
Regression testing is usually performed after code changes, sanity testing is done after minor changes, and smoke testing is done before more in-depth testing.
Example: After a new feature is added, regression testing ensures that existing features still work, sanity testing checks the new feature, and smoke testing verifies basic functionality.

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