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Regression testing is a set of tests designed to detect defects in already tested components of a software application. This process is carried out in order not to be absolutely sure of bugs’ absence but to search for regression errors and fix them.

Regression errors are nothing more than bugs, but they can be identified when adding a new software component to the existing build or when fixing other bugs that may have caused the occurrence of new defects in an already tested product.

Regression testing is run on an every new software build to confirm bug fixes in the old builds. This procedure is necessary to make sure that old defects have not occurred after the build upgrade.

Thus, we can state that the goal of regression testing is to make sure that fixing of some bugs will not result in the occurrence of other bugs and that there are no new defects in an already verified code after the build upgrade. 

Regression testing services are provided to verify the system’s components after they have been proven structurally sound. This happens after the release of codes changes or new functionality.

regression testingTypes of regression tests:

  • Verification tests. They are performed to ensure that previously found and uncovered bug has been repaired.
  • Build verification testing. Is based on smoke testing principles and testing of software build: checking the correctness of core functionality in each new software build.
  • Regression Testing Itself – repeated execution of all the tests that were created and carried out before.  They are run by using already existing test cases no matter if bugs were found or not during their execution.

Statements on how to carry out regression testing:

  • Start with the build verification (the software build testing and smoke testing).
  • Checking of fixed bugs.
  • Regression tests mainly do not cover the application completely, but only those its components that are somehow associated with the build’s changes.
  • Then, testing is extended to check for all previously found bugs.

Addressing application testing services providers you will save on cost and effort to enhance the quality of your app and speed up its time to market throughout the testing lifecycle. Top testing companies along with other software testing organizations often use specialized bug detection tools (for example, bug tracking systems) that are very helpful in finding software defects  and monitoring the process of their repair.


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