Differences between Functional and Non-Functional Testing

One major question which comes in the mind of the testers is to understand the major difference between functional and non-functional testing. Functional testing, as the name depicts, revolves around the complete functional aspects of the system or sub-systems and how proficiently the system carry out its functions. Functional testing typically verifies that features work according to necessities, whereas non-functional testing performs checks on performance and quality concerns. This type of testing is done by specifications given by the client, or use cases provided by the designer team. The most common strategies for functional testing are black box testing techniques—in which the tester doesn’t require to review the internal source code, however, validates functionality by testing various input combinations.

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What are the parameters tested under functional testing?

During the process of functional testing, there are quite a few factors that determine the performance and functionality of the app is tested. These can be classified into four types, which are mentioned below:

  • Functions: Testers analyses the core functions of the software apps.
  • Ease of access: Functional testing tests the accessibility of the application.
  • Error Conditions: Here the error is tested to confirm whether the suitable fault message is showed or not when there are any flaws or error in the system.
  • Usability: The basic usability of the system is tested, where the testers ensure and confirm whether or not the users are able to navigate through the app smoothly.

Functional and Non-FinctionalWhat about Non-Functional Testing?

Non-functional testing is basically done against the non-functional necessities, or which aren’t covered in functional testing like scalability, performance, behavior, or security of application under certain constraints. For instance, functional testing might reveal the test for inputting data and its expected behavior, while non-functional testing discloses a time taken for a document to get saved. Consequently, non-functional testing reveals how the system behaves as compared to what the system is predicted. This type of is equally significant as functional testing and affects customer satisfaction.

What are the parameters tested under functional testing?

While performing non-functional testing, tester team are keenly focused on app testing against the non-functional requirements. Therefore, some of the factors tested by non-functional testing are:

  • Efficiency: This type of testing estimate the limit of the software system’s quantity, capacity, & response time
  • Security: Prevents the software system from unexpected and deliberate attacks from external and internal sources.
  • Interoperability: Test out the software system’s interoperability with other software systems.
  • Reliability: This type of testing makes sure that the software product performs constantly without any fault and failure.
  • Flexibility: Testers validate that the software can work smoothly on several software and hardware configurations.

Although dissimilar from each other, functional testing & non-functional testing, both are the fundamental part of STLC (Software Testing Life Cycle) as they support software testers several important components and features of the software product, such as its functionality, performance, quality, and more. Therefore, performing functional testing & non-functional testing is truly significant for testers to guarantee that clients get amazing user experience, with exclusive and innovative features.

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