Non Regression Testing A Quick Overview

Non Regression Testing: A Quick Overview

Before getting into the topic of Non-Regression testing, Let’s brush up!

When a new code change is made, it can mess up how the software works. Even a tiny change can cause unexpected problems or create new bugs. That’s where Regression testing comes in.

Regression testing means running tests to ensure the new code changes didn’t mess up anything already working. But sometimes, there isn’t enough time or resources to run all the tests again. In those cases, the testing team will only check the parts of the system where the changes were made. That’s called non-regression testing.

This blog will be your guide and tell you more about non regression testing.

non-regression testing

What is Non Regression Testing?

Non Regression Testing is a software testing technique that ensures a new or modified functionality works correctly with the assumption that the previous functionality was not affected. This technique involves testing only the evolving unit or module rather than the entire product to conserve resources and time.

Difference between Regression Testing and Non-Regression Testing

Regression and Non-regression Testing are two software testing techniques used in software development. The below table summarizes the difference between regression testing and non-regression testing.

Regression TestingNon Regression Testing
The aim is to prevent past bugs.The aim is to identify bugs in new functionality or features.
Focuses on the stability of the existing system.Focuses on validating newly added functionality.
Ensures that past changes do not negatively impact existing functionality.Ensures that new functionality or features are working as intended.
Performed after bug fixes, updates, or changes.Usually performed after the completion of new functionality or features.
Occurs after changes to the software are made.It occurs during the development process or after new features are released.
Requires existing test cases to be re-executed.Requires new test cases to be developed and executed.

Steps of Non-Regression Testing

The steps involved in Non-Regression testing include several key elements.

  1. Prepare Test Cases: Test cases that test the new code changes are prepared in this stage.
  2. Execute Test Cases: This will involve running the test cases against the modified version of the software so that any issues can be identified.
  3. Analyze Results: After executing the test cases, we need to analyze the results. This will involve looking at the results of the tests and determining if the new change is working as impacted.
  4. Report Findings: Report the results of the non regression testing to the relevant stakeholders to identify any issues that need to be resolved.
  5. Retest: The application should be retested once any new issues have been identified.

Use of Non Regression Testing

We use non-regression testing to test new features and functionalities. This is a check to ensure that recent changes are working as expected and does not test the existing features.

When should we automate Non-Regression testing?

Automate non regression testing when the software system is stable enough to be tested automatically. Check that: – There are no frequent changes to the system – There is a clear set of expected results – The cost of automating the tests is justified. However, it is important to note that not all non-regression testing can or should be automated, as some aspects may require human judgment and analysis.

Testsigma for automation of your tests for web mobile APIs and Desktops

Testsigma is a cloud-based test automation platform that enables teams to automate their non-regression tests for web, mobile, APIs, and desktop applications. With Testsigma, teams can easily create and edit automated tests using simple English. Thus, It allows testers to focus on exploratory testing and defect hunting while the automated tests run in the background. Testsigma supports multiple browsers and devices and provides a variety of integrations with third-party tools like JIRA, Jenkins, GitHub, and more. It also offers a range of features for test management, including test case management, test suite creation, and test execution reporting. Testsigma is also available as an open-source and free version.


Here we are; time to Wrap up! So now you know, Non-regression testing is used when system features evolve, or you can call new features added. Overall, this testing checks for any unexpected issues that might occur due to new changes made to the codebase. This testing helps to maintain software quality assurance and should be incorporated into every development cycle.

Frequently Asked Questions

When should you Automate Non-Regression Testing?

Non-regression testing should be automated when the non-regression tests need to be executed repeatedly, or, if they are too complex to be executed manually.

What is a Non-Regression Testing Example?

Feature testing or functionality testing that is focused on testing new developed features/functionalities in a product is an example of non-regression testing.

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