A few weeks ago, we shared a short five-step guide with you on functional testing. What we didn’t discuss, however, is non-functional testing. So, what’s the difference between the two? After all, they both share the word “functional,” so what’s really going on here? Before you go around telling everyone, “Oh, yeah, I know all about the two. How difficult can it be? They’re both around functional testing,” let's take a moment to break it down and discuss the discrepancies between the two.
Now, before we go into logistics, here is the primary difference between the two we want you to know: Functional testing checks specific functions of the software application, while non-functional testing checks the non-functional aspects of the application.
Goal: Functional testing tests the functionality of the software application against business requirements – without any knowledge of code – and determines if the application meets business specifications such as integrations, user commands, business processes, data manipulation, etc.
Flow: Functional testing is traditionally executed first – before non-functional testing.
Types of Functional Tests:
Functional Testing Checklist Examples:
Goal: Non-functional testing tests external aspects of the software application and verifies its quality attributes such as speed, scalability, reliability, performance, etc.
Flow: Non-functional testing is executed after functional testing has been carried out.
Types of Non-Functional Tests:
Non-Functional Testing Checklist Examples:
These are just some of the differences between functional testing and non-functional testing. Functional testing essentially tests whether the software application meets user requirements, while non-functional testing tests whether the software application meets user expectations. Both are necessary to ensure a quality product is released to your customers. Without both tests, you run the risk of releasing a product that will ultimately fail – losing you loyal customers and overall profit.