To be able to run unit tests in a Linux-based Jenkins instance, you just need to SSH into the Jenkins instance and run the following command:
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb sudo dpkg -i google-chrome-stable_current_amd64.deb
When installing, you may run into a dependency issue, if so, run:
sudo apt-get install -f sudo dpkg -i google-chrome-stable_current_amd64.deb
After Google Chrome is installed, you should be able to run
npm test, meaning you can use Jenkins to run unit tests in the CI process.