Google Cloud 上的 Codeceptjs 函数 goto of undefined

我正在尝试使用在 Google Cloud Function 中运行的 CodeceptJS（带有 Puppeteer）来自动化网络活动。 我的 index.js 是：

const Container = require('codeceptjs').container;
const Codecept = require('codeceptjs').codecept;
const event = require('codeceptjs').event;
const path = require('path');

module.exports.basicTest = async (req, res) => {  

  let message = '';

  // helpers config
  let config = { 
    tests: './*_test.js',
    output: './output',
    helpers: { 
      Puppeteer: { 
        url: '', // base url
        show: true,
        disableScreenshots: true, // don't store screenshots on failure
        windowSize: '1200x1000', // set window size dimensions
        waitForAction: 1000, // increase timeout for clicking
        waitForNavigation: [ 'domcontentloaded', 'networkidle0' ], // wait for document to load
        chrome: {
          args: ['--no-sandbox'] // IMPORTANT! Browser can't be run without this!
        }
      } 
    },
    include: {
      I: './steps_file.js'
    },
    bootstrap: null,
    mocha: {},
    name: 'basic_test',

    // Once a tests are finished - send back result via HTTP
    teardown: (done) => {
      res.send(`Finished\n${message}`);
    }
  };

  // pass more verbose output
  let opts = {
    debug: true,
    steps: true
  };

  // a simple reporter, let's collect all passed and failed tests
  event.dispatcher.on(event.test.passed, (test) => {
    message += `- Test "${test.title}" passed