});
        }
    }

    /**
     * Updates the application configuration.
     *
     * @return A string containing the results of the update.
     */
    public String updateConfiguration() {
        final StringBuilder buf = new StringBuilder();
        updateConfigListenerMap.entrySet().stream().forEach(e -> {
            buf.append(e.getKey()).append(": ");
            try {

        assertFalse(helper2.isEoled());
    }

    @Test
    public void test_updateConfiguration() {
        assertNotNull(systemHelper.updateConfiguration());
        systemHelper.addUpdateConfigListener("XXX", () -> "OK");
        assertTrue(systemHelper.updateConfiguration().contains("XXX: OK"));
    }

    @Test
    public void test_isChangedClusterState() {
        systemHelper.isChangedClusterState(0);