You don't usually need a separate installer for JUnit. Modern versions of the Eclipse IDE already come with JUnit built-in. You just need to tell your specific project to use it. 3 Ways to Add JUnit to Your Project
If you’re working with Java, unit testing is essential. JUnit is the industry standard for this, and setting it up in Eclipse is straightforward. download junit for eclipse
Depending on how you manage your project, you’ll use one of these three methods. 1. The "Built-in" Way (Recommended for Beginners) You don't usually need a separate installer for JUnit