Change unit test to be final

tests/event/events_test.php

@@ -27,7 +27,7 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  * @covers    \qbank_importasversion\event\question_version_imported
  */
-class events_test extends \advanced_testcase {
+final class events_test extends \advanced_testcase {
 
     public function test_imported_is_logged(): void {
         global $USER;