What are the 7 types of regression testing?

Regression testing is a crucial part of the software testing process, ensuring that new code changes do not adversely affect the existing functionality of the software. Here are seven types of regression testing:

Corrective Regression Testing

• Description: This type is used when no changes are made to the existing functionality. It focuses on re-running the existing test cases to ensure that the unchanged parts of the software still work as expected.
• Use Case: When minor bug fixes are applied that do not alter the existing code significantly.

Retest-All Regression Testing

• Description: In this approach, all the tests in the test suite are re-executed to ensure that the recent changes have not affected the existing functionality.
• Use Case: Suitable for smaller projects or initial stages of testing where the test suite is manageable.

Selective Regression Testing

• Description: Only a subset of test cases is selected and executed based on the code changes. It reduces the testing effort by focusing only on the areas impacted by the changes.
• Use Case: When there are minor updates or changes to specific modules of the software.

Progressive Regression Testing

• Description: This type is used when new test cases are designed and added to the existing test suite. It ensures that both new and existing functionalities are working correctly.
• Use Case: When new features or functionalities are added to the software.

Complete Regression Testing

• Description: Involves a thorough test of the entire application, typically performed when there are significant changes in the code or the software’s environment.
• Use Case: After major updates, such as a new version release or significant architectural changes.

Partial Regression Testing

• Description: Focuses on testing the code that has been modified, along with the related modules, to ensure that the changes do not introduce new defects.
• Use Case: When changes are limited to specific areas of the application and it is unnecessary to test the entire application.

Unit Regression Testing

• Description: Involves re-running unit tests that verify the functionality of individual components or units of code. It ensures that the individual units perform as expected after code changes.
• Use Case: During the development phase when changes are made to specific units or modules of the software.

By understanding and applying these types of regression testing, you can ensure thorough validation of software changes while optimizing testing efforts.

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