Test setup Download the attached files and place them: 50520test.php : in the root of your moodle installation test.mustache : in lib/templates Purge your caches. Javascript test Go to Site administration -> Development -> Template library and view the new template, core/test . Right-click the search icon that is displayed and inspect it, verifying that the alt text for the image is "Search" (or the equivalent in your active language pack). PHP test Go to 50520test.php. Right-click the search icon that is displayed and inspect it, verifying that the alt text for the image is "Search" (or the equivalent in your active language pack).