Setup The following steps should be run on a Moodle site without the patch. Login as admin Go to Site admin > Plugins > Plugins overview and search for "Assignment 2.2 (Disabled)" Verify that you see 2 results. Check the following SQL query return 0 rows if you don't have any records. select * from mdl_assignment; Check the following SQL query return 1 row. select * from mdl_config_plugins where plugin = 'mod_assignment' ; Add a new record to mdl_assignment table by running the following SQL: INSERT INTO mdl_assignment ( name , intro) VALUES ( 'Assginment 2.2' , 'Assignment 2.2 intro' ); Apply the patch and run the site upgrade. Verify that you cannot continue the site upgrade due the environment check being failed with Assignment 2.2 is in use . Test scenario for upgrade Stand up a fresh site from master branch Apply the patch Perform the upgrade Login as an admin Go to "Site administration > Plugins > Plugins overview". Verify  there is no longer a mention of 'Assignment 2.2'. Verify that the "mdl_assignment" relation does not exists by running the following SQL query. select * from mdl_assignment; Verify that the mod_assignment has been deleted from the database by running the following query which will return 0 rows. select * from mdl_config_plugins where plugin = 'mod_assignment' ; Test scenario for fresh install Create a new freshly install site Apply the patch Verify that there is no longer a mention of 'Assignment 2.2' in Site admin > Plugins > Plugins overview Verify that the "mdl_assignment" relation does not exists by running the following SQL query. select * from mdl_assignment; Verify that the mod_assignment has been deleted from the database by running the following query which will return 0 rows. select * from mdl_config_plugins where plugin = 'mod_assignment' ; Test scenario for backup and restore (Post mod_assginment removal) Login as admin Access to "Site administration > Courses > Restore course". Import the  mootieuk12.mbz  backup file. Restore as a new course Verify that you see an error saying "Invalid get_string() identifier: 'pluginname' or component 'assignment'. Perhaps you are missing $string ['pluginname'] = ''; in mod/assignment/lang/en/assignment.php?" Finish the restore process as a new course Access to the restored course. Verify that the "Preparation" section has only 2 activities ("Assignment 2: Join our discussion forum" and "Assignment 3: Give your vote"). The assignment activities "Assignment 1: Create your personal profile" and "Assignment 4: Create and submit a paper" shouldn't be created. Test scenario for backup and restore (Reinstall the mod_assignment) Get the mod_assignment plugin from here Put all the plugin files in mod/assignment Run the the site upgrade Follow the steps from Test scenario for backup and restore (Post mod_assginment removal) Verify that you don't see any errors and you should also see what you did not see in step 8 in Test scenario for backup and restore (Post mod_assginment removal)