JUnit 5 Setup in IntelliJ, Eclipse, Maven, and Gradle

A practical setup guide for JUnit 5 covering all major IDEs and build tools. Explains how to add the Jupiter API and engine dependencies, enable native JUnit 5 support in Gradle (4.6+) via useJUnitPlatform() and in Maven via Surefire 2.22.0+, and configure IntelliJ IDEA and Eclipse. Also covers fallback options: running JUnit 5 tests through a JUnit 4 runner using JUnitPlatform, and using the standalone console launcher from the command line. Notes on version compatibility and coexistence of multiple JUnit versions in the same project are included.