Complete Guide to Regression Testing in Software Testing

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Regression Testing

In the dynamic world of software engineering, software applications’ continuous improvement is inevitable. With each update, developers introduce new features. They also fix bugs and enhance functionalities to meet user needs. However, making these changes can inadvertently impact other parts of the application. This leads to unintended issues or “regressions.” This is where regression testing in software testing becomes essential.

This is to ensure that software changes do not negatively impact existing functionalities. This practice involves retesting the software. It is after updates to detect and fix any unintentional side effects. 

By conducting thorough regression testing, software engineers can confidently release updates. Knowing that the software maintains its quality and performs as expected for end-users. In this blog, we will look at what regression testing in software testing is. We will also examine its advantages, types, best practices, and more. So let’s get started.

What is regression testing in software testing? 

Regression testing is a type of software testing. It verifies if recent changes to an application have affected its existing features. It also ensures that after making any modifications, the application still functions correctly. Moreover, it oversees no new problems or “regressions” have been introduced. With this brief on regression testing, let us now jump on to the advantages to see what it offers to the users.

What are the benefits of regression testing in software testing?

The following are the advantages of regression testing. 

  • Detecting software defects – Regression testing helps identify defects. One that may occur due to code changes or updates. Moreover, by catching issues early, developers can fix them before they impact the end users. As a result, this leads to a more reliable and bug-free application.
  • Maintaining software quality – Software regression testing helps maintain the overall quality and reliability of the software. This is by ensuring that existing features work as intended after updates. As a result, this boosts user confidence and satisfaction.
  • Preventing software failures – Unintentional changes in the code can sometimes lead to critical failures. Regression testing minimizes the risk of such failures. This is by thoroughly testing all functionalities. This is one of the most valuable benefits of regression testing in software testing.
  • Enhancing software stability – Consistent regression testing allows developers to keep the software stable. It also helps in keeping it reliable even as it evolves over time. It assures that new features don’t interfere with existing ones.
  • Saving time and effort – Automated regression testing can be performed quickly and repeatedly. This saves time and effort, especially when making frequent updates or bug fixes.
  • Supporting continuous integration – Software regression testing is an integral part of continuous integration pipelines. It ensures that new code changes integrate seamlessly with the existing codebase.

Now let’s look at the types of regression testing in software testing.

What are the types of regression testing in software testing?

In this section, we will look through the types of regression testing. This will help you understand and choose what works best for you. So let’s look.

  • Functional regression testing – Functional regression testing ensures that all the existing functions still work after updates. This includes login, search, and checkout. By testing these features, we confirm that the software’s core functionalities remain intact.
  • Unit regression testing – Unit regression testing in software testing focuses on testing individual units. This includes functions or methods. This is to check for any new bugs introduced during development. Moreover, it helps in catching issues at a granular level. This ensures that each part of the software works as expected.
  • Partial regression testing – Only specific parts of the software affected by recent changes are tested in this. By targeting these areas, we save time and resources. This is while still ensuring the most crucial functionalities remain functional.
  • Full regression testing – Full regression testing in software testing covers the entire software application. It tests all features and functionalities. This comprehensive approach ensures that no part of the software is left untested. Moreover, it gives developers confidence in the overall software quality.
  • Selective regression testing – Selective regression testing involves choosing a subset of test cases. This is based on their importance and relevance. Furthermore, by carefully selecting test cases, we focus on critical functionalities. Moreover, we efficiently validate changes.
  • Progressive regression testing – Progressive regression testing is conducted as the software evolves over time. It ensures continuous validation of changes made during development. Moreover, it keeps track of any new issues that may arise. As a result, this iterative approach guarantees that the software remains stable. Moreover, it oversees that it remains reliable throughout its lifecycle.

So now, let’s look at the best practices you can maintain in the next section. 

What are the best practices for regression testing?

You must maintain some practices to extract the maximum benefits of regression testing in software testing. What are these practices? Let’s find out!

  • Thorough test coverage – Test all critical features and important software parts. This is to catch any issues that may have been introduced by recent changes. Moreover, covering a wide range ensures a comprehensive assessment. This is regarding the software’s stability.
  • Automate whenever possible – Use automation tools to repeat tests quickly and accurately. As a result, it will save time and effort. Automated regression tests can be easily executed after each update. As a result, this allows the team to focus on more complex testing tasks.
  • Selective test case selection – Choose essential test cases to focus on the most critical functionalities. This makes regression testing techniques in software testing efficient. Prioritizing high-impact test cases ensures that essential parts of the software are validated.
  • Continuous integration – Integrate regression testing into the development process. This is to catch issues early and often. The team can quickly identify and address potential regressions. This is by conducting frequent regression tests with each code change.
  • Test impact analysis – Analyze the impact of changes. This is to identify which areas need testing, ensuring a targeted approach. Furthermore, understanding the scope of changes helps in optimizing regression test suites.
  • Version control – Keep track of changes and versions. This is to ensure testing aligns with the right software version. Moreover, this helps in maintaining consistency and preventing confusion during testing.
  • Defect reporting and tracking – Report and track any defects found during testing. This ensures they are addressed promptly. Effective defect management also ensures that identified issues are resolved. This is before the software is released.
  • Test data management – Use realistic and relevant test data. This is to simulate real-world scenarios accurately. Moreover, proper test data management ensures valid test results.


We are living in a technologically advanced world. The audience expects more and more from software applications especially. Moreover, the choices in apps make them nontolerant. Especially to bugs, etc. This makes it necessary for you to do regression testing in software testing. By thoroughly testing each change and update, we ensure that our software maintains its integrity. 

Embracing the best practices of regression testing empowers us. This is to deliver software products of the highest quality. As a result, it will instill confidence in our users. As software engineers, let us embrace regression testing in software testing. This should be a driving force behind our commitment to excellence. It not only prevents potential disasters but also paves the way for innovation. 

We position ourselves at the forefront of the ever-advancing technology landscape. This is by implementing regression testing diligently. And also by integrating it seamlessly into our development process.

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Roy M is a technical content writer for the last 8 years with vast knowledge in digital marketing, wireframe and graphics designing.

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