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Non-functional testing verifies the way software works and how well it works. There are several non-functional testing types, including performance testing, load testing, stress tests, volume tests, security tests, upgrade and installation testing, and recovery tests. All of these fall in the category of non-functional testing types.
Nonfunctional testing is important. But what's the difference between functional and non-functional testing? Find out more about these differences in this blog, plus get a breakdown of popular non-functional testing types.
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Non-functional testing verifies how applications work against specific requirements by examining things like performance, accessibility, reliability under load, and UX. Non-functional testing refers to testing properties that do not impact the application functionality, but contribute to the overall user experience.
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The difference between functional testing and non-functional testing is what they test.
Functional testing ensures that the functions and features of the application work properly. Non-functional testing examines other aspects of how well the application works.
Functional testing tests the functionality of an app. Non-functional testing tests the performance of these functions.
Some examples of functional testing include unit testing, integration testing, API testing, exploratory testing, and critical business flow testing, These all test functional aspects of the website or mobile app.
Examples of non-functional testing types are listed down below.
Non-functional testing is just as critical as functional testing. And because teams need to conduct a mix of different types of testing, you need to be doing both.
Non-functional testing makes applications more usable and reliable. Unfortunately, it can often be rushed in an effort to meet release deadlines.
When non-functional testing is overlooked, performance and UX defects can leave users with a bad experience and cause brand damage. Worse, applications could crash with an influx of users. Accessibility defects can result in compliance fines. And their security could be at risk.
The risks associated with leaving non-functional testing to the last minute are why organizations are looking for ways to incorporate non-functional testing types into the sprints themselves.
Non-functional testing is an umbrella term. There are many non-functional testing types. Here are some of the most popular examples:
The traditional approach towards non-functional testing means it occurs at the end of the software delivery process, sometimes even extending beyond. Too often, non-functional testing is either left to the end of the cycle or done only partially. Or, it’s outsourced externally, where it is performed manually due to a lack of time and automation abilities.
In these cases, critical tests don’t run in time to fully guarantee the delivery readiness of upcoming releases. This risks brand damage, compliance issues, and worse.
What can be done to fix this?
Modern testing frameworks and cloud-based solutions allow earlier testing in the SDLC. These allow for the identification and resolution of non-functional testing defects. Without non-functional testing early in the cycle, these defects have the potential to delay releases. Therefore, non-functional testing reduces costs, unnecessary effort, and risk.
Early testing also smooths the transition from development to functional and non-functional testing.
Technology is only one half of the equation though. A cultural commitment to Agile principles is also needed. Teams need to constantly monitor and fine-tune their tests so that they are aligned, well-perceived, and trusted.
Learn about using tools to find code vulnerabilities, ensure standards compliance, and reduce time-to-market early in the development process with Perforce's Shift Left 101 >>
Non-functional testing is a critical part of any testing strategy. But it has to be able to scale to your testing needs.
Our complete continuous testing platform focuses on shifting both your functional and non-functional testing left, offering industry-first support for top testing use cases, such as:
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See how Perfecto can help you ratchet up your non-functional testing and boost your testing strategy. Get your free trial today.
DevOps Chief Evangelist & Sr. Director at Perforce Software, Perfecto
Eran Kinsbruner is a person overflowing with ideas and inspiration, beyond that, he makes them happen. He is a best-selling author, continuous-testing and DevOps thought-leader, patent-holding inventor (test exclusion automated mechanisms for mobile J2ME testing), international speaker, and blogger.
With a background of over 20 years of experience in development and testing, Eran empowers clients to create products that their customers love, igniting real results for their companies.