Jan 11

What is Functional Testing?

Functional Testing
  • Functional Testing: 

Functional testing is nothing but what the system actually does. To verify that software applications each function behaves as specified in the requirement document. To check all the functionalities of the application by providing appropriate input and verifying whether the output is matching the expected output or not. The Testers need not concern about the source code of the application because it comes under black-box testing.

  • Black Box Testing technique is used during functional testing, in which tester test without knowing internal logic of the. Functional testing is usually performed at the test level of System Testing and Acceptance testing.
  • Functional testing involves the following steps:
  • The software is expected to perform certain functions we identify them using functional testing.
  • Based on the function’s specifications we create input data.
  • Based on the function’s specifications we determine the output.
  • Executing the test cases.
  • Comparing the actual output with expected outputs.
  • When the test conditions are created directly from user/business requirements the functional testing is more effective. The defects in the documentation will not be detected through testing when test conditions are created from the system documentation when end-users finally use the software this may be the cause of user dissatisfaction.
  • Example of functional testing

Let us consider that a bank wants software for banking purpose and it asks the company to develop this software. When the user enters valid user name and password, then he is taken into the homepage. Once he go to the homepage and then when he clicks on amount transfer another page at the bottom is displayed. He enters his account number which is valid and also the account number to which we need to transfer the money. Then he enters the amount that he wants to transfer and clicks on transfer. Then the transferred amount should be transferred to the required account.

  • Benefits with Functional Testing:
  • Helps to deliver user-satisfied applications.
  • Before application delivery it ensures all the client requirements are met.
  • Enhances the quality of the application.
  • It is helpful to eliminate defects or errors in the application.
  • It also helps to ensure that all the applications and there functionalities are working properly.

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