[Test] Investigate navigation timeout for networkidle0

[timothywangdev]

Follow the suggestion from puppeteer/puppeteer#1908 (comment)

and add the following tracking code

class InflightRequests {
  constructor(page) {
    this._page = page;
    this._requests = new Set();
    this._onStarted = this._onStarted.bind(this);
    this._onFinished = this._onFinished.bind(this);
    this._page.on('request', this._onStarted);
    this._page.on('requestfinished', this._onFinished);
    this._page.on('requestfailed', this._onFinished);
  }

  _onStarted(request) { this._requests.add(request); }
  _onFinished(request) { this._requests.delete(request); }
 
  inflightRequests() { return Array.from(this._requests); }  

  dispose() {
    this._page.removeListener('request', this._onStarted);
    this._page.removeListener('requestfinished', this._onFinished);
    this._page.removeListener('requestfailed', this._onFinished);
  }
}

received the following reports:

  console.error src/tests/e2e/emailTransferForm.test.e2e.js:119
    Navigation failed: Navigation timeout of 30000 ms exceeded

  console.error src/tests/e2e/emailTransferForm.test.e2e.js:121
      http://172.17.0.3:3000/sockjs-node/092/h5meigsq/xhr_streaming?t=1586976964888

  console.error src/tests/e2e/emailTransferForm.test.e2e.js:119
    Navigation failed: Navigation timeout of 30000 ms exceeded

  console.error src/tests/e2e/emailTransferForm.test.e2e.js:121
      https://api-iam.intercom.io/messenger/web/metrics
      http://172.17.0.3:3000/sockjs-node/820/gm0xzxqp/eventsource

  console.error src/tests/e2e/emailTransferForm.test.e2e.js:119
    Navigation failed: Navigation timeout of 30000 ms exceeded

  console.error src/tests/e2e/emailTransferForm.test.e2e.js:121
      http://172.17.0.3:3000/sockjs-node/779/gqa4csjh/eventsource

seems to be caused by react websocket?

[timothywangdev]

may be related to react hot loading module
https://github.com/facebook/create-react-app/blob/ebebe80383eb15b4759a0cd5ea12015eaac94c0e/packages/react-scripts/config/webpack.config.dev.js#L58

[timothywangdev]

First build then serve -s build disabled hot loading