While JUnit was originally developed for unit testing, TestNG is useful for other types of tests such as integration tests. Learning or using TestNG is not difficult. If you’ve learned JUnit, mastering TestNG should be a trivial matter. In this article, I am gathering resources about TestNG that you might find useful.
First of all, please have a look at this tutorial. In my opinion, this is the best starting point.
TestNG Tutorial
TestNG Tutorial – 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.
The following link has a nice video that teaches how to use TestNG in Netbeans for automatic test case generation.
https://netbeans.org/kb/docs/java/testng-screencast.html
Photo by Carrie Frizzlechicken 
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TestNG Resources by Psyops Prime is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.