functional testing definition
DEFINITION. Functional Testing is a type of software testing whereby the system is tested against the functional requirements/specifications. ELABORATION. Functions (or features) are tested by feeding them input and examining the output.ypically, functional testing involves the following steps: 1  Identify functions that the software is expected to perform. 2  Create input data based on the functionâs specifications. 3  Determine the output based on the functionâs specifications.