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TestNG is a java testing framework. It was created by Cédric Beust out of frustration over JUnit's deficiencies. It was designed to cover all categories of tests such as unit, functional, integration, etc.

The idea is very simple. It is breakdown into the following steps:

1. Create your class.
2. Create test scenarios by using methods of your class and then you have to implement the logic to check whether the methods behave correctly or not. If they do, then tell TestNG that it is good. Otherwise, tell it it is bad.

At the end, TestNG will report whether methods behave correctly or not.