Functional testing checks that every Function of the product/software application works in conformance with the requirement determination/specification. This testing mainly includes black box testing and it is not worried about the source code of the application.
Every single Functionality of the framework is tried/tested by giving suitable info, checking the output and comparing the genuine/actual results and the expected results.
This testing includes checking of User Interface, APIs, Database, security, client/server applications and usefulness of the Application Under Test. The testing should be possible either physically/manual or automation mechanization.
What to verify in Functional Testing?
The prime target of Functional testing is checking the functionality of the product framework. It is mainly focuses on -
Mainline capacities/Functions:- Testing the principle elements of an application.
Fundamental/Basic Usability:- It includes essential usability testing of the framework. It checks whether a client/user can navigate/explore through the screens with no challenges.
Availability:- Checks the openness of the framework for the client/user.
Mistake/Error Conditions:- Usage of testing strategies to check for bugs conditions. It checks whether suitable mistake messages are shown.