Functional testing is one of the mainline processes of an application or software testing that individually measures every function of an application. Functional testing is performed to ensure that the application works as expected in the real-world scenarios and meets the desired specifications.

The leading QA companies regard functional testing as a valuable method for quality assurance which allows the testers to verify the output provided against the expected output. Simply put, functional testing looks at how an application is intended to perform and makes sure it actually does that. When functional QA services conduct functional tests, they typically follow procedures which look similar to the ones mentioned below

  • Use test data provided by Dev to describe inputs
  • Determine the expected outputs be based on these inputs
  • Use the inputs to run test cases
  • Compare the results to the expected outputs

Functional Testing

Process of Functional Testing

Some of the critical steps through which an application undergoes during the process of functional testing are as under:

Unit testing

Tests an individual unit of the software to make sure it performs appropriately. The primary purpose of this process is to segregate each part of the application and test them individually. It isolates the piece of code from the entire code structure and determines if it responds as expected.

Smoke testing

Tests the major snippets of the code non-inclusive manner to ensure the application works well enough to move on to additional QA processes. This features identifying the critical functionalities of the end users that a software must satisfy by imitating the basic functionalities of the software.

Regression testing

It increases the possibilities of finding the errors caused by making enhancements to the application or software. After an update is implemented in an application, the program is tested again to determine if the update has met its desired purpose and hasn’t created any unintended bug in the process. Some common tools used by functional QA services providers for regression testing include Winrunner, UFT, and Selenium.

Sanity testing

An application undergoes sanity testing once major code changes have been made in the code. This is important to ensure that updates to the code did not create any unexpected bug or error.

User acceptance testing

This is the final step in the testing process before a software or application is rolled out for production. As the name implies, this step ensures that the application is able to meet the needs of the end users.


Depending upon the complexity of an application, functional testing can be a time-consuming process. This can eventually affect the deadline for the project depending on the bugs or errors found during testing. So, it completely makes sense for a business to invest in a functional testing services provider that can keep the Dev team on track during the QA phase.

Author: arobil