Nightwatch Selenium在Ubuntu中作为服务运行时“挂断”

Question

在尝试其他方法，请原谅我，这不是一个好方法。我已经开发了Nightwatch的端到端（E2E）测试代码，并且如果它是通过nodejs（node main.js）直接运行main.js，那么效果很好。

但是当我作为服务运行（sudo systemctl启动mytesting.service）时，出现以下错误：

Starting selenium server...
started - PID:  2949
[test / Job] Test Suite
Running:  [0;32mDemo test Google
 Error retrieving a new session from the selenium server[0m

Connection refused! Is selenium server started?
{ Error: socket hang up

  at createHangUpError (_http_client.js:331:15)
  at Socket.socketCloseListener (_http_client.js:363:23)
  at emitOne (events.js:121:20)
  at Socket.emit (events.js:211:7)
  at TCP._handle.close [as _onclose] (net.js:554:12) code: 'ECONNRESET' }

配置-nightwatch.json

{
"output_folder": "temp",
"src_folders": ["/home/ubuntu/test/lib"],
"selenium": {
    "start_process": true, /* tried false too*/
    "server_path": "/home/ubuntu/test/bin/selenium-server-standalone-2.39.0.jar",
    "log_path": "",
    "port": 4444,
    "cli_args": {
        "webdriver.chrome.driver": "/home/ubuntu/test/bin/chromedriver"
    }
},
"test_settings": {
    "default": {
        "launch_url": "http://localhost",
        "selenium_port": 4444,
        "selenium_host": "localhost",
        "globals": {
            "myGlobal": "testst"
        },
        "desiredCapabilities": {
            "browserName": "chrome",
            "javascriptEnabled": true,
            "marionette": true,
            "acceptSslCerts": true,
            "chromeOptions": {
                "prefs": {
                    "download": {
                        "prompt_for_download": false,
                        "default_directory": "/home/ubuntu/test/downloads/"
                    }
                },
                "args": ["--no-sandbox", "window-size=1280,800"]
            }
        }
    }
  }
}

main.js

try {
const nightwatch = require('nightwatch');

const argv = {
    config: 'nightwatch.json',
    test: 'test.js',
    env: 'default',
    foo: 'bar',
};

const done = function() {
    console.log('nightwatch complete');
}; // your callback function

var settings = {
    globals: {
        foo: 'one',
        bar: 'two'
    }
};

  nightwatch.runner(argv, done, settings);

} catch (error) {
  console.log('Exception:' + error.message);
}

欢迎提出建议，谢谢您的努力。