Run full behat suite Edit help_ajax.php At some point after config.php has been included, throw a new moodle_exception Open the login page in the browser Click on the help icon Confirm that the ajaxException dialogue was displayed Remove the moodle_exception echo out some random junk at the end of the file Click on the help icon again Confirm that an exception dialogue was displayed Edit enrol/yui/rolemanager/rolemanager.js Find the visible : true line, and remove it Login to moodle as an admin/manager/teacher Navigate to a course's enrol page Remove a role from a user Confirm that you get a confirmation dialogue Navigate to a course and turn editing on Open the activity chooser Confirm that it was shown as expected Cancel the activity chooser Reopen it Confirm that it was shown again Add a new assignment instance As a student, upload a PDF to it Confirm that the filepicker was not displayed until you requested it As a tutor, Launch the PDF editor Confirm that no new dialogues are visible initially Click on the comment search button Confirm that the dialogue is now visible We have few examples of M.core.alert in core, and these are very difficult to force a display of so skipping testing for these.