What is a regression test in software?
Tags: regressiontest, regressiontesting, regression
Published: 2022-12-23 08:39:45

Regression testing plays an integral role in the software development process that is focused on maximizing output and helps in providing a proper pathway for testers and developers. Regression testing ensures that enhancements, bug fixes or adding new functionality or feature does not disrupt the existing functionalities of the application. In this article, you will get to know the strategic [importance of regression testing](https://hruskawilliam.medium.com/explain-about-regression-testing-strategy-4d3e8031c31c). 

**What is regression testing?**

It is a testing method that runs after every change made in the software development process to ensure that the changes that have been introduced will not alter or affect the existing functionalities. A common issue that is faced by developers is tackling old bugs (if there are any) with the new changes being introduced in the code.
Strict version control systems should be implemented in a project so that it will be easy to trace which specific change has introduced a bug. To eliminate such kind of issues, a robust regression test strategy should be incorporated and implemented in a project.

**The strategic importance of [regression testing](https://www.testingxperts.com/blog/regression-testing-strategy):**

A test is written for a known bug and this test is re-run after every change is made to the code base. This helps in identifying changes that might have reintroduced the bug. Through the regression test process, the product team can expect more informative feedback and instant response. Early detection of new bugs in the deployment cycle can take place so that businesses need not spend on maintenance and costs in order to solve the built-up defects.

**Regression test example:**
For example, there is an IT company that is soon going to release a video editing product. Releasing the first build is the primary requirement, keeping in perspective only the core features. 1000 test cases are used to conduct regression tests to make sure the freemium or basic editing functionalities are working fine before releasing a product. If the tests are successfully passed by the initial build, then it is ready to hit the market.

The video editing product has been well-received in the market and is already making waves. The team further decides to add a few more premium features. Those specific features are added by the product team and incorporated into the existing application. But, as new codes have been added, there is a need to conduct regression tests again. The functionality of those new features is verified by writing 100 new test cases. But, those old 1000 test cases need to be re-run to ensure they are working as expected, despite making changes in the code.   

**Regression testing techniques:**

**1. Unit regression testing:** It uses a meticulous approach to test the code. A list of items is tested by the tester each time a change, modification or update occurs in the code. This technique is best suited to initiate the process of regression testing.

**2. Partial regression testing:** This technique divides the project into coherent, logical units that are working together in order to form the entire application. Those units need to be selected that are crucial to the application and then specific test cases need to be defined for them. For the rest of the modules, unit regression testing can be performed.

**3. Complete regression testing:** A comprehensive view of the codebase is taken, so that all functionalities can be identified that would affect the usability and thus write in-depth tests for each of them. 

**Conclusion:** If you are looking forward to implementing regression testing for your specific project, then do get connected with a reliable and competent software testing services company that will provide you with strategic testing solutions that are in line with your project specific requirements.

**About the author:** I am a technical content writer focused on writing technology specific articles. I have covered relevant information about regression tests so that readers can obtain specific information about this important testing method. I strive to provide well-researched information on the leading market savvy technologies.