assertFalse(helper2.isEoled());
    }

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

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

                }
                System.setProperty(e.getKey(), e.getValue());
            });
        }
    }

    public String updateConfiguration() {
        final StringBuilder buf = new StringBuilder();
        updateConfigListenerMap.entrySet().stream().forEach(e -> {
            buf.append(e.getKey()).append(": ");
            try {