TestNG is a testing framework for the Java Programming language. TestNG is designed to cover all categories of tests: unit, functional, end-to-end, integration, etc. TestNG is an annotation-based testing framework, which draws on some of the shortcomings of JUnit by adding features such as flexible fixtures, test categorization, parametric testing, and dependent methods.
This framework, is used to organize different tests, and to report results. TestNG is a testing framework inspired from JUnit and Nunit, but introduces some new functionalities that make it more powerful and easier to use, such as annotations and parameters that give you much more flexibility in your testing.