What Are the Advantages of Regression Testing?

What Are the Advantages of Regression Testing?
February 02 08:37 2017  

Updated in January 2021

Regression testing is performed when there are any modifications of the code or changes of some features. This type of software testing helps to verify whether the system operates properly after undergoing some code modifications. It is also used to make sure that the system did not regress, and the old bugs that have already been fixed did not reappear after the new changes.

The main aim of regression testing is to discover the errors that may be introduced accidentally after:

  • adding a new feature
  • enhancing the software
  • fixing a bug of any kind

Also, regression testing helps to make sure that the bugs detected during performance testing are fixed, and the procedure of their removal does not influence the proper work of the code in any way.

Advantages of regression testing

  • Regression testing improves product quality.
  • This type of testing can be automated.
  • It ensures that the fixed bugs and issues do not reoccur. 
  • This type of testing verifies that the modifications do not impact the correct work of the already tested code and detects any side effects.
  • Regression tests can be used during integration testing. In this case, they will be more useful.

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To effectively perform regression testing, the QA experts use special techniques. 

Types of regression testing techniques:

Corrective Regression Testing:

  • It checks how the new code influences the code that has already existed.
  • Tests can be reused. 
  • There are no changes in the specifications.

Progressive Regression Testing:

  • The program specifications change.
  • New tests are created.

Retest All Strategy:

  • The whole system is retested to make sure no bugs appeared or reappeared after the changes.
  • All tests are reused.
  • It is an expensive and time consuming procedure.

Selective Strategy:

  • Only the part of the system that is likely to be most affected by the changes is retested after the changes.
  • Only the tests directly connected with the modified code fragment are rerun.
  • This method is faster and cheaper than Retest All Strategy, but some bugs can remain undetected. 

Conclusion

Regression testing is an important part of the testing process and strategy, which helps to prevent bugs at the early stages and ensures that everything is working properly after any modifications. We hope that this article helped you to understand or clarify the meaning of regression testing, its advantages, and types of testing strategies. If you have any questions about regression testing, feel free to contact our QA experts any time.

 

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Nataliia Vasylyna
Nataliia Vasylyna

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