What is functional and regression testing?

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Functional testing verifies that the software meets the specified requirements, while regression testing ensures that the existing functionality is not affected by new changes.

Functional testing focuses on testing the individual functions or features of the software.
Regression testing is performed to ensure that the existing functionality is not broken after making changes or adding new features.
Functional testing is usually performed before regression testing.
Functional testing can include test cases like input validation, boundary value analysis, and user interface testing.
Regression testing involves retesting the previously tested functionalities to ensure they still work as expected.
Regression testing can be automated to save time and effort.
Example: In functional testing, a test case could be to verify that a login function accepts valid credentials and rejects invalid ones.
Example: In regression testing, a test case could be to verify that a bug fix does not introduce any new issues.

What is functional and regression testing?

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