Non-Functional Regression Testing: A Comprehensive Guide

Feb. 26, 2024, 3:46 p.m.

Non-functional regression testing ensures software works well by testing performance, scalability, reliability, and usability.

Non-Functional Regression Testing: A Comprehensive Guide


When it comes to software testing, most people are familiar with the concept of functional testing - making sure the software does what it's supposed to do. However, non-functional regression testing is a lesser known but equally important aspect of software testing. In this guide, we'll take a deep dive into what non-functional regression testing is, why it's important, and how to effectively implement it in your testing strategy.

What is Non-Functional Regression Testing?

Non-functional regression testing is the process of testing the non-functional aspects of your software, such as performance, scalability, reliability, and usability, to ensure that any changes or updates to the software have not negatively impacted these critical areas. Essentially, it's making sure that your software not only works, but works well.

Why is Non-Functional Regression Testing Important?

Imagine this scenario: your team has just implemented a new feature in your software, and everything seems to be working perfectly. However, a few days later, you start receiving complaints from users about slow loading times and crashes. It turns out that the new feature has caused a bottleneck in the system, impacting the overall performance of the software. This is where non-functional regression testing comes in - to catch these types of issues before they can negatively impact your users.

Types of Non-Functional Regression Testing

There are several key types of non-functionall regression testing that you should consider incorporating into your testing strategy:

  • Performance Testing: This type of testing evaluates how well your software performs under various load and stress conditions. Tools like Scanerr can help you simulate different user scenarios to identify performance bottlenecks.

  • Scalability Testing: Scalability testing helps determine how well your software can handle increases in user traffic or data volume. By gradually increasing the load on your system, you can identify potential scalability issues before they become a problem.

  • Reliability Testing: Reliability testing focuses on ensuring that your software operates consistently and reliably under different conditions. This can include testing for error handling, fault tolerance, and system recovery.

  • Usability Testing: Usability testing evaluates the overall user experience of your software, including factors like ease of use, responsiveness, and accessibility. Tools like Scanerr can help you gather feedback from real users to identify potential usability issues.

Best Practices for Non-Functional Regression Testing

Now that you understand the importance of non-functional regression testing, here are some best practices to help you effectively implement it in your testing strategy:

  • Start Early: Incorporate non-functional regression testing from the beginning of your development process to catch issues early on.

  • Automate Testing: Use automation tools like Scanerr to streamline the testing process and ensure consistent, reliable results.

  • Set Clear Goals: Clearly define your testing objectives and success criteria to ensure that you are testing the right aspects of your software.

  • Monitor Performance: Continuously monitor the performance of your software in production to catch any regressions that may arise after deployment.

  • Collaborate: Involve all stakeholders in the testing process to gather diverse perspectives and ensure thorough coverage of non-functionall aspects.

With these best practices in mind, you can confidently integrate non-functional regression testing into your software testing strategy to ensure that your software not only works, but excels in the key non-functional areas that matter most to your users.


In conclusion, non-functional regression testing is a critical aspect of software testing that is often overlooked. By incorporating it into your testing strategy and following best practices, you can identify potential issues early on, ensure a positive user experience, and ultimately deliver high-quality software that meets the needs of your users.

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