Prerequisite Another test site with the same version you're testing that does not have the patch. Setup Download the test script to your moodle root folder: master and 400: svgtest.php 311: svgtest_311.php Download the list of changed SVG files to your root folder: master and 400: changed.txt 311: changed_311.txt Edit the test script and change " $beforesite " with the value pointing to your test site that does not have the patch. e.g. if you're testing on 311 and you have the unpatched 311 version on " localhost/stable_311 ": $beforesite = 'http://localhost/stable_311/'; Note: Trailing slash important! Test Open the test script on your browser Confirm that all icons listed are of grey colour. Compare the SVG icons before and after the patch: Confirm that the icons after the patch are a bit darker than before. Inspect one of the SVG icons after the patch using your browser dev tools Confirm that the SVG icon after the patch has a fill colour of #888. Confirm that the SVG icons after the patch are the same size as those before. Check the PNG files Confirm that the PNG files after the patch are a little darker than before. Confirm that the PNG files after the patch are roughly the same size as those before the patch.