Not able to use "assertWaitOnAjaxRequest" method after Drupal core update
After updating to Drupal core 10.2 which has the changes from this issue in place. All our existing tests that are extended from "ExistingSiteSelenium2DriverTestBase" are failing when calling the "assertWaitOnAjaxRequest" method.
The failures are due to missing the testing module "js_testing_ajax_request_test" which the method is now relying on. See https://www.drupal.org/project/drupal/issues/3410181