What are the different types of regression testing?

What is regression testing?

It is a testing method that ensures any modifications, changes or updates done to software application does not affect the existing functionality or working of the software application. Whenever there is a change in the code, regression testing is performed. A partial or full selection of test cases that have already been executed are re-executed in order to ensure that the existing functionalities are working just fine. 

Following are the seven types of regression testing:

1. Corrective regression testing: When there are no relevant changes that have been introduced in the specifications of the product, then is when this testing type is considered. There is no need for any new test cases to be built, as the test cases that are already existing can be reused for testing purposes and thus derive expected results.

2. Retest-all regression testing: In this testing type, existing aspects of a specific product are tested along with reusing all the test cases. If there are small changes that need to be made, then this testing type is not advisable.

3. Selective regression testing: The impact of the new piece of code that has been added to the existing application is analyzed using this testing method. This testing type ensures that a subset of the existing test case is used. Through this, the cost involved in retesting is further reduced and also efforts are being saved to develop a new test case from scratch.

4. Partial regression testing: This testing type is conducted when new codes are being added up to the already existing piece of code. This testing type is performed in order to know whether the system is performing exactly in the same way as it was earlier after the new code has been added up.

5. Complete regression testing: This testing method is best suited when there are major changes being made in the test code. When there is a major change in the software’s root code, then is when this testing type is used. 

6. Progressive regression testing: If there are small changes that need to be done in the program specifications, then progressive regression testing is implemented. This testing type ensures that the previous features are as it is without any changes or modifications, despite coming up with a new version.

7. Unit regression testing: This testing type is performed to ensure that during the testing activity, all the resultant dependencies are blocked. Various factors such as the criticality of certain features along with recurring defects are focused upon in this testing type. The main objective of this testing method is to deliver a unit of code that brings enhanced value to the application as a whole.  

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