How To Perform Functional Testing

QASource Engineering Team | December 11, 2023

How To Perform Functional Testing

Functional testing is basically a technique that is used in software testing to confirm that a system is operating in accordance with the functionality specified by a business. There are various teams involved in the development of a software product, like Business analysts, Development team, QA team, and the DevOps team.

Functional testing is performed to ensure that all the features of the application are working as intended for the end user and in accordance with the software's specifications. Testing is crucial if you want to ensure that a function's output meets user expectations.

List of variables assessed using functional website testing:

  • Database Testing
  • Application programming interfaces (APIs) for web and mobile apps
  • There are various tools being used to test the API like REST API, POSTMAN etc. to ensure that everything is working fine at the back-end
  • Data flow is validated in database testing so that data flowing among various microservices can be validated at the back end
  • Client and server application security and threat level testing
  • Few software companies are setting up security teams to perform security testing. A special infrastructure is required to perform this kind of testing, and it is also cost effective.
  • Fundamental capabilities of the application

This is also known as black-box testing, where we validate all functionalities against the established business requirements.

The basic steps to perform web testing are as follows:

  • Perform regression testing
  • Understand the functionality of the website, define entry and exit criteria
  • Design the test cases according to the scenarios where we can check the functionality of the application
  • Create input data and define the expected output. Execute the test cases, then compare the actual output with the expected output
  • Track the defects and send a report to the project manager


This publication is for informational purposes only, and nothing contained in it should be considered legal advice. We expressly disclaim any warranty or responsibility for damages arising out of this information and encourage you to consult with legal counsel regarding your specific needs. We do not undertake any duty to update previously posted materials.

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