What Is Functional Testing?

A special technique for checking software quality,black-box, at which the application or system function is tested against the requirements and generating the desired outcome is called functional testing.

For performing the checking of the correct product operation, the specialists create test cases and test scenarios in order to ensure maximum test environment. The number of cases required for functional testing depends on system peculiarities.


Frequently, test cases consist of the following components:

  • a brief test summary report,
  • preliminary conditions (if any),
  • steps to execute test scenarios,
  • test data (if any),
  • expected result,
  • comments (if any).

The specialists may execute two forms of testing the software product functional.

What are the functional checking forms?

  1. Requirements-based testing
  2. Business scenario testing

Conducting software testing based on functional requirements, the specialists create test cases on the available requirements which are provided on the client-side. The checking process itself is performed in accordance with the designed test scenarios.

In the case of functional testing on the basis of business scenarios, the product checking procedure is fulfilled in terms of business requirements. The choice of one or another functional testing form depends on the client.

Functional testing, as system testing or integration checking, plays an important part in ensuring high product quality. But all testing types have as pluses, as minuses.

A possible testing redundancy and the high possibility that the specialist may miss up severe errors in the system logic of the product under test are among the disadvantages of functional checking.