Theme Selector This test is to check that the changes to the theme selector UI worked correctly. Modify your config.php (in your root moodle install directory) and set a theme property on the $CFG object, e.g. $CFG->theme = 'clean' Log in as admin Go to the theme selector Site administration > Appearance > Themes > Theme Selector Confirm that you still have the "clear themes cache" button Confirm that you are told that the theme has already been configured (should say "Defined in config.php") and it's locked for changes. Modify your config.php again and add $CFG->thememobile = 'clean' or $CFG->thememobile = 'more' View the theme selector again Confirm that now the row for the mobile theme is also locked and that it matches the config you set, showing the "Defined in config.php" message. Confirm that you are not able to change any of the locked devices (have a look at theme/index.php source code and try sending different params to the page to trigger a theme change) Confirm the unlocked devices do continue working (set, change, unset). Course and Course category Themes This test it to check that you can still set course/coursecat level theme overrides while the overall site theme is locked. Make sure you've got theme set in your config.php (as above) Enable course/coursecat theme settings (allowcoursethemes, allowcategorythemes) Edit a course/coursecat and change the theme to a different one. Save and view the course and confirm that the correct theme is used. User Themes This test it to check that you can still set user while the overall site theme is locked. Make sure you've got theme set in your config.php (as above) Enable course/coursecat theme settings (allowuserthemes) Go to your profile and change theme to a different one. Save and view that, from that moment, you always get the user theme used instead of the locked one. URL Themes This test it to check that you can still set theme overrides via URL. Make sure you've got theme set in your config.php (as above) Enable url theme change (allowthemechangeonurl) Go anywhere in your site and add &theme=someothertheme and verify the theme changes accordingly.