    @Test(expected = UnsupportedOperationException.class)
    public void testSyncChangedUsers() throws Exception {

        String realmId = UUID.randomUUID().toString();
        Date lastSync = new Date();
        factory.syncChangedUsers(keycloakSessionFactory, realmId, userFederationProviderModel, lastSync);
        verifyZeroInteractions(keycloakSession, keycloakSessionFactory, realmId, userFederationProviderModel, lastSync);
    }