Fast: Runs tests significantly faster than human users.

Repeatable: Testers can test how the website or software reacts after repeated execution of the same operation.

Reusable: Tests can be re-used on different versions of the software.

Reliable: Tests perform precisely the same operation each time they are run thereby eliminating human error.

Comprehensive: Testers can build test suites of tests that covers every feature in software software application.

Programmable: Testers can program sophisticated tests that bring hidden information.

Functional Testing

  • It produces a defect-free product/software.
  • It ensures that the customer/end-user is satisfied.
  • It ensures the all the requirements are met.
  • It ensures the proper working of all the functionalities of an application/software/product.
  • It ensures that the software/product works as expected.
  • It ensures security and safety.
  • It improves the quality of the product.
  • The risks associated with the product/software are reduced and in turn the loss is also reduced.


​It is important to validate that the requirements of a new software release or application work correctly and as designed within the provided specifications.  The quality of the product substantially improves when software QA is conducted on software throughout the development process all the way to end-user implementation.

Benefits of Functional Testing

Software testing where the system is tested against the actual functional requirements and software specifications of a new software build.  

How Functional Testing works

Software testing where the system is tested against the actual functional requirements and software specifications of a new software build.  

Functions (or features) are tested by feeding them input and examining the output. Functional testing ensures that the requirements are properly satisfied by the application. This type of testing is not concerned with how processing occurs, but rather, with the results of processing. It simulates actual system usage but does not make any system structure assumptions.

During functional testing, Black Box Testing technique is used in which the internal logic of the system being tested is not known to the tester.

Functional testing is normally performed during the levels of System Testing and Acceptance Testing.

Typically, functional testing involves the following steps:

  1. Identify functions that the software is expected to perform.
  2. Create input data 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.

Functional testing is more effective when the test conditions are created directly from user/business requirements. When test conditions are created from the system documentation (system requirements/ design documents), the defects in that documentation will not be detected through testing and this may be the cause of end-users’ wrath when they finally use the software.