Functional testing is a quality assurance 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
Functional testing should be kept external to the application as much as possible. qa programmer provides features that can be made required, so that this criterion is met.
Qa programmer provides un-matched access to internal properties and methods of the applications for a more in-depth level of functional testing.
Qa programmer can get access to the application’s internal details which solve this potential problem.