Functional testing is software testing in which the system is subjected to functional specifications testing. Typically, functions’ testing is accomplished by supplying the functions with input and subsequently analyzing the output.
It constitutes a full integration system to analyse the compliance of the system with its specified requirements. Functional testing primarily focuses on the results of processing. It ensures that the application satisfies the requirements properly.
While performing functional testing, the black box testing technique is applied whereby the tester is unaware of the system’s internal logic being tested.
Functional testing types include smoke testing, unit testing, sanity testing, interface testing, integration testing, UAT, regression testing and system testing. Automating functional testing can help save costs and time since automated tests usually run repetitively at the same cost.