Notes All the tests must be done with PHP 8.1 The need to be performed with both MOODLE_401_STABLE and master. The test require modifying code (a little bit) and removing some plugins. DEBUG DEVELOPER and display errors have to be enabled. If using MDK, run " mdk run mindev " Also web server error logs at hand. You can use the tail command... e.g. " tail -f /path/to/apache2/error.log ". On Ubuntu, the path to the error log is usually in /var/log/apache2/error.log Before the patch (without the changes applied). Reproduce the problem. Install a Moodle site from moodle.git repository. With defaults everywhere. Manually, remove a couple of plugins from code (for example the admin/tool/dbtransfer and the filter/urltolink ones). Edit version.php and change the last digit of the $version variable. For example: -$version = 2023022400.00; // YYYYMMDD = weekly release date of this DEV branch. +$version = 2023022400.01; // YYYYMMDD = weekly release date of this DEV branch. Logged in as admin visit http://your_site_url/admin/index.php Verify that you're in a "Upgrading Moodle database from version..." page. Press "continue" until you arrive to the "Plugins check" page. Verify that the "Plugins check" page shows the 2 removed plugins as "Missing from disk!" Verify that, in the page OR on the web server error logs you've got the 2 "PHP Deprecated" warnings in the description of the issue. After the patch (with the changes). Confirm the fix. Simply ensure that now you're using the patched code in the same site (switch to integration.git repository). Also, check that the plugins removed in the previous section as of point #2 continue removed (remove them again if needed to). And that the version.php $version variable continues being incremented as of point #3 of previous section. Reload the browser (F5). Verify that the "Plugins check" page shows the 2 removed plugins as "Missing from disk!" Verify that, in the page OR on the web server error logs you don't get any "PHP Deprecated" warnings any more.