Functional testing is a quality assurance (QA) process and a type of black-box testing that bases its test cases on the specifications of the software component under test. Functions are tested by feeding them input and examining the output, and internal program structure is rarely considered (unlike white-box testing). Functional testing usually describes what the system does.
Functional testing typically involves six steps
The identification of functions that the software is expected to perform
The creation of input data based on the function’s specifications
The determination of output based on the function’s specifications
The execution of the test case
The comparison of actual and expected outputs
To check whether the application works as per the customer need.
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