}

    public void test_getHostnamet() {
        assertNotNull(systemHelper.getHostname());
        try {
            envMap.put("COMPUTERNAME", "xxx");
            assertEquals("xxx", systemHelper.getHostname());
        } finally {
            envMap.remove("COMPUTERNAME");
        }
        try {
            envMap.put("HOSTNAME", "yyy");
            assertEquals("yyy", systemHelper.getHostname());

        shutdownHookList.add(hook);
    }

    public String getHostname() {
        final Map<String, String> env = getEnvMap();
        if (env.containsKey("COMPUTERNAME")) {
            return env.get("COMPUTERNAME");
        }
        if (env.containsKey("HOSTNAME")) {
            return env.get("HOSTNAME");
        }
        try {
            return InetAddress.getLocalHost().getHostAddress();