Generic Notes These testing instructions should be carried out twice (once with jsrev = -1, once without) to confirm that the correct versions of JS are used and work as expected. Tip : Open your browser's developer toolkit, open the 'Network' activity tab, and restrict to 'Scripts'. Note : You may find that the script you're looking for is included with a number of other scripts - this is because of our combo loading. You can turn off comboloading to make it easier to check the relevant script by setting $CFG->yuicomboloading = false; , but you should check that functionality works with combo loading enabled. To test the minified code: Required settings: $CFG->jsrev = -1; $CFG->debug = (E_ALL | E_STRICT); Notes Check that the minified version of this module is loaded. It will have -min.js in the filename but please ensure content is also be minified and to test the non-minified code: Required settings: $CFG->jsrev = -1; $CFG->debug = 0; Notes Check that the non-minified version of this module is loaded. It will have -debug.js in the filename and the file content should not be minified. Module-specific test instructions Open a course Add a Calendar block Navigate to the Calendar view Create a couple of calendar events Go back to the course page Mouse over the calendar entires you just added Confirm that the calendar entry is shown in an Overlay with the correct data