Note: For each branch you will need to stop and restart the docker image. Start Selenium Chrome Docker image: docker run --shm-size=2G -p 4444:4444 --rm --name sel selenium/standalone-chrome:3.141.59-20200515 Unzip the attached 69278.zip file in your moodle document root unzip 69278.zip Ensure that your behat is configured such that you can make use of the docker image for testing I typically set the behat_wwwroot to http://host.docker.internal/path/to/site Init behat php admin/tool/behat/cli/init.php Run the new behat feature included in the zip file using the command supplied in the init, for example: vendor/bin/behat --config /Users/nicols/Sites/moodles/sm/moodledata_behat/behatrun/behat/behat.yml mod/book/tests/behat/test.feature Confirm that all tests passed Run it again but after the first dot appears run the following command docker cp bad/google-chrome-stable sel:/usr/bin/ Let the tests finish Confirm that the scenarios after you copied the script failed Confirm that none of the scenarios were skipped Run it again Confirm that the tests didi not start and exited immediately with a stack trace containing debugging information