package.json

{
  "name": "wd-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "wdio wdio.conf.js",
    "test:watch": "wdio wdio.conf.js --watch"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@wdio/cli": "^5.9.3",
    "@wdio/dot-reporter": "^5.9.3",
    "@wdio/firefox-profile-service": "^5.7.8",
    "@wdio/local-runner": "^5.9.3",
    "@wdio/mocha-framework": "^5.9.3",
    "@wdio/selenium-standalone-service": "^5.9.3",
    "@wdio/spec-reporter": "^5.9.3",
    "chai": "^4.2.0"
  }
}

wdio.conf.js

exports.config = {  
    specs: ["./test/e2e/*.spec.js"],
    services: ["firefox-profile", "selenium-standalone", "chromedriver"],
    capabilities: [
      {
        "browserName": "chrome",
        "goog:chromeOptions": {
          "args": ["disable-infobars"]
        }
      }
    ],
    filesToWatch: [
        'test/**/*.js'
    ],
    updateJob: false,
    exclude: [],
    suites: {},
    logLevel: "silent",
    coloredLogs: true,
    screenshotPath: "./error/screenshots",
    waitforTimeout: 30000,
    deprecationWarnings: false,
    plugins: {
      "wdio-screenshot": {}
    },
    framework: "mocha",
    reporters: ["spec"],
    mochaOpts: {
      ui: "bdd",
    //   compilers: ["js:babel-register"],
      timeout: 60 * 1000
    },
  
    // Gets executed before all workers get launched.
    onPrepare() {},
    // Gets executed before test execution begins. At this point you will have access to all global
    // variables like `browser`. It is the perfect place to define custom commands.
    before() {
      const chai = require("chai");
      global.expect = chai.expect;
    },
    after() {},
    // Gets executed after all workers got shut down and the process is about to exit. It is not
    // possible to defer the end of the process using a promise.
    onComplete() {}
  };