What is Functional Testing?

Functional Testing is the type of black box testing, used to test the functional features of the software based on the functional design documentation or the actual customer requirements of the system. Functionality of the software is tested with specific positive and negative scenarios test cases. In positive scenario, tester will be providing desired input with intention to get desired output. In negative scenario, tester will be providing invalid input with intention to get expected invalid output/valid error message trigger accordingly. Bottom line, functional testing is done to validate the actual behavior of the software application.

For Example: Let us see online job application form for functional testing. Here I shown two test cases one for positive scenario and other for negative scenario.

1. Providing valid details as input on job application form, in this case the output result could be user should able to submit the form successfully.

2. Providing invalid details as input on job application form, in this case the output result could be user shouldn’t able to submit the form successfully and as well user should get valid error message to resubmit with valid input.