@Test
    void verifyOperation() {
        assertNotNull(firebaseCloudMessagingNotificationSender);
        assertNotNull(notificationSender);
        val id = UUID.randomUUID().toString();
        val principal = CoreAuthenticationTestUtils.getPrincipal(Map.of("registrationToken", List.of(id)));
        assertDoesNotThrow(() -> {
            notificationSender.notify(principal, Map.of("title", "Hello", "message", "World"));
        });
    }
This is {@link GoogleFirebaseCloudMessagingNotificationSenderTests}.

@author Misagh Moayyed
@since 6.3.0
support/cas-server-support-notifications-fcm/src/test/java/org/apereo/cas/notifications/GoogleFirebaseCloudMessagingNotificationSenderTests.java