The Functional Testing is the type of software testing that validates the software system against the functional requirements. The purpose of functional tests is to test each function of the software application. It is mainly concerned with the black box testing and is the source code of application. This testing checks User Interface, APIs, Database, Security and the other functionality of application under test. The testing done either manually or through automation tool.
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Following is a step by step process on How to do Functional Testing :