TestNG is a testing framework for the Java programming language created by Cédric Beust and inspired by JUnit and NUnit. The design goal of TestNG is to cover a wider range of test categories: unit, functional, end-to-end, integration, etc., with more powerful and easy-to-use functionalities. TestNG is a testing framework developed in the lines of JUnit and NUnit, however, it introduces some new functionalities that make it more powerful and easier to use. TestNG is designed to cover all categories of tests: unit, functional, end-to-end, integration, etc., and it requires JDK 5 or higher. This tutorial provides a good understanding on the TestNG framework needed to test an enterprise-level application to deliver it with robustness and reliability.