Run behat on a small tag (e.g. @block_html) Verify that the behat run works, that the environment information is printed set your behat_wwwroot to something which doesn't match the moodle install, but does return a http response Run behat Verify that you get an error about site not available (" {yourbadbehatwwwroot} is not available, ensure you specified 'correct url and that the server is set up and started.") and the process stops. # set your behat_wwwroot to something which doesn't even resolve # Run behat # Verify that you get an error about site not available ("{yourbadbehatwwwroot} is not available, ensure you specified 'correct url and that the server is set up and started.") and the process stops.