Types of Functional Testing | Digivante

Types of Functional Testing

by The Community, 15th January 2020

Problem – This article about ‘functional testing’ will help you learn more about testing, requirements and the approaches to functional testing.
Solution – Define the most common functional testing types, walk through the process involved when performing functional testing and defining the advantages of functional testing.
Read Time – 3 Minutes

In this modern era of technology, most organizations conduct their businesses using readily available technologies such as websites and mobile applications. For customers to continue using these website and mobile applications, every aspect such as the speed and quality of the digital experience is vital. Testing, therefore, plays a crucial role in improving the quality, reliability, and performance of the system.

Functional testing is built up of many different categories, all of which have their own benefits and requirements that aim to improve the digital performance and quality of your website or app. Here are the most common:

  • Unit Testing: This is a type of testing performed by using scripts that test if individual components/units of an application match the requirements. Its purpose is to validate that each unit of the software performs as designed.
  • Smoke Testing: Also known as Build verification. This is done after the release of each build to ensure that software stability is intact to ascertain the most important functions work.
  • Sanity Testing: This is performed after smoke testing. It is done to verify that every major functionality of an application is working perfectly to validate that the bugs have been fixed and no further issues occur as a result of these changes.
  • Regression Testing – This is defined as a type of software testing to confirm that a recent program or code change has not adversely affected existing features.
  • Integration Testing: In Integration testing, individual software modules are combined and tested to evaluate the compliance of the system with specified functional requirements.
  • Usability Testing: Evaluation of a product by testing it on real users in a production environment.

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Process of functional testing

When performing functional testing on your website or application, defining user and business requirements improve the effectiveness of your test as your test is carted to your personal business standards. This will allow you and your internal teams to understand what is required, and to gauge how a system behaves under certain conditions or using different inputs

Typically, functional testing involves these 6 following steps:

  1. Identify the performance specification of the software.
  2. Create input based on the function’s specifications.
  3. Determine the output based on the function’s specifications.
  4. Execute the test case.
  5. Compare the actual and expected outputs.
  6. Record your findings

Advantages of functional testing 

Here are some of the advantages of functional testing:

  • Improving digital performance
  • Risks associated with software use is reduced
  • Improves customer satisfaction
  • A guideline to ensure all requirements are met
  • Improves the security of the system which includes critical areas such as payment integration.


Functional testing has proven to be an effective process of testing systems and ensuring they are working as per the functionalities specified in the business document. It is, therefore, crucial to perform this process to guarantee user satisfaction.

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Article by The Community

Our community of testers are experts in their field, from accessibility to usability insights there's nothing they don't know about website testing.


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