What Is JUnit (Java Unit) 5?

JUnit (Java Unit) 5 is a more complex system to write repeatable tests for Java applications. It is composed of several different modules from three different sub-projects.

1. The JUnit Platform - Serves as a foundation for launching testing frameworks on the JVM. It also defines the TestEngine API for developing a testing framework that runs on the platform. Furthermore, the platform provides a Console Launcher to launch the platform from the command line and the JUnit Platform Suite Engine for running a custom test suite using one or more test engines on the platform. First-class support for the JUnit Platform also exists in popular IDEs (see IntelliJ IDEA, Eclipse, NetBeans, and Visual Studio Code) and build tools (see Gradle, Maven, and Ant).

2. JUnit Jupiter - Is the combination of the programming model and extension model for writing tests and extensions in JUnit 5. The Jupiter sub-project provides a TestEngine for running Jupiter based tests on the platform.

3. JUnit Vintage - Provides a TestEngine for running JUnit 3 and JUnit 4 based tests on the platform. It requires JUnit 4.12 or later to be present on the class path or module path.

The diagram below shows you the architecture the JUnit 5 system:

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For more information, see JUnit Website

⇒ Build Tools for JUnit 4

⇐ Introduction of JUnit (Java Unit) 5

⇑ Introduction of JUnit (Java Unit) 5

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