Functional Testing

An alternative way of black box testing is to check the functionality of the modules, which is called the functional testing.This testing, verifies that the application working as per the specification or the client view. Function testing includes the testing of the entire interface.

Functional testing is classified in two categories

1. Positive testing
Positive Testing is carried with an idea of checking whether the Application works as per requirements or not. In other words, making sure of whether the system does what it should really is intended to do.Its verify the system by using the valid input data to ensure the successful completion.

2. Negative testing
Negative testing is aimed to detect the possible application crashes in different situations. Ensures that your application can systematic handle invalid input or unexpected user actions. For example, if a user tries to type a letter in a numeric field, the correct behavior in this case would be to display the “Incorrect data type, please enter a number” message. The purpose of negative testing is to detect such situations and avoid applications from crashing. Also, negative testing helps you improve the quality of your application and find its weak points.