JUnit vs TestNG: What are the differences?

Developers describe JUnit as "A programmer-oriented testing framework for Java". JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks. On the other hand, TestNG is detailed as "A testing framework inspired from JUnit and NUnit". It is a testing framework designed to simplify a broad range of testing needs, it covers all categories of tests: unit, functional, end-to-end, integration, etc.Run your tests in arbitrarily big thread pools with various policies available (all methods in their own thread, one thread per test class, etc.

JUnit and TestNG can be categorized as "Testing Frameworks" tools.

JUnit is an open source tool with 7.56K GitHub stars and 2.83K GitHub forks. Here's a link to JUnit's open source repository on GitHub.