What is regression testing, smoke testing,unit testing?

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Regression testing ensures changes don't break existing functionality. Smoke testing checks basic functionality. Unit testing tests individual units of code.

Regression testing: retesting of previously tested functionality to ensure changes haven't introduced new defects
Smoke testing: quick check to ensure basic functionality is working before more comprehensive testing
Unit testing: testing individual units of code to ensure they function as expected
Example: Regression testing would involve testing a feature that was previously working after changes have been made to the codebase
Example: Smoke testing would involve checking if a website's homepage loads and basic links work
Example: Unit testing would involve testing a single function or method in isolation

What is regression testing, smoke testing,unit testing?

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