@Override
        public NotificationSender configureNotificationSender() {
            return NotificationSender.noOp();
        }
This is {@link DefaultNotificationSenderTests}.

@author Misagh Moayyed
@since 6.3.0
core/cas-server-core-notifications/src/test/java/org/apereo/cas/notifications/push/DefaultNotificationSenderTests.java