What is the major difference between TestNG and JUnit

The Major difference between TestNG and JUnit test frameworks is their scope. I suggest using TestNG as the core unit test framework for a Java project, because TestNG is more advanced in parameterize testing, dependency testing and suite testing (Grouping concept). TestNG is meant for high-level testing and complex integration tests. Its flexibility is especially useful with large test suites. In addition, TestNG also covers the entire core JUnit4 functionality. It’s just no reason for me to use JUnit anymore.