: Check the Installed plugins tab to ensure it is active. 2. Manual Installation (For Offline/Restricted Servers)

How to install a plugin in Jenkins manually - Stack Overflow

While newer versions of Jenkins often include this plugin by default, many environments require manual installation or updates. Methods to Install the JUnit Plugin 1. Using the Jenkins Web Interface (Simplest Method) This is the most common approach for administrators.

: Click the Available plugins tab and type "junit" into the search bar.

: Visit the JUnit Plugin page on a machine with internet access and download the latest version.