seleniumを起動しようとしてもエラーがでてしまい困っております...。

前提・実現したいこと

https://hackernoon.com/a-guide-to-tdd-a-react-redux-todolist-app-part-1-b8a200bb7091
上記のWEBサイトのチュートリアルを使って、React.jsでtodo-listを作成しています。この記事の後半で、環境構築している中でe2e-testを実行しました。その作業の中でseleniumが起動しないというエラーが発生しました。下記がエラーメッセージになります。

ERROR: Cannot define class using reflection chrome at new RuntimeError

(/Users/hajimenagasaka/my-react-todolist/node_modules/webdriverio/build/lib/utils/ErrorHandler.js:144:12) at Request._callback

(/Users/hajimenagasaka/my-react-todolist/node_modules/webdriverio/build/lib/utils/RequestHandler.js:316:39) at Request.self.callback

(/Users/hajimenagasaka/my-react-todolist/node_modules/webdriverio/node_modules/request/request.js:186:22) at emitTwo (events.js:126:13) at Request.emit (events.js:214:7) at Request.

(/Users/hajimenagasaka/my-react-todolist/node_modules/webdriverio/node_modules/request/request.js:1163:10) at emitOne (events.js:116:13) at Request.emit (events.js:211:7) at IncomingMessage.

(/Users/hajimenagasaka/my-react-todolist/node_modules/webdriverio/node_modules/request/request.js:1085:12) at Object.onceWrapper (events.js:313:30)

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! my-react-todolist@0.1.0 e2e-tests: wdio

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the my-react-todolist@0.1.0 e2e-tests script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

該当のソースコード

App.jsの中身です。

import React from 'react';

const App = () => (
  <div>My App</div>
);

export default App;

test.jsの中身

test.js
1const expect = require('chai').expect;
2
3describe('TodoList App', () => {
4  it('Should load with the right title', () => {
5    browser.url('http://localhost:3000/');
6    const actualTitle = browser.getTitle();
7
8    expect(actualTitle).to.eql('Todo List');
9  });
10});
11

試したこと

seleniumサーバーが起動しないということだったので、seleniumのテストを行いましたが、それもエラーが発生しました。下記がそのエラーメッセージになります。

selenium
1Selenium 2.0/webdriver protocol bindings implementation with helper commands in nodejs.
2
3For a complete list of commands, visit http://webdriver.io/docs.html.
4
5======================================================================
6
7ERROR Couldn't find a running selenium server instance on [object Object]/Users/hajimenagasaka/node_modules/chainit/index.js:140
8
9throw err;
10^
11
12Error: [init()] <= Couldn't connect to selenium server at makeError (/Users/hajimenagasaka/node_modules/webdriverjs/lib/utils/makeError.js:9:17)
13
14at RequestHandler.<anonymous> (/Users/hajimenagasaka/node_modules/webdriverjs/lib/utils/RequestHandler.js:177:25)
15
16at self.callback (/Users/hajimenagasaka/node_modules/request/request.js:122:22) at emitOne (events.js:116:13)
17
18at Request.emit (events.js:211:7)
19
20at ClientRequest.self.clientErrorHandler (/Users/hajimenagasaka/node_modules/request/request.js:231:10)
21
22at emitOne (events.js:116:13)
23
24at ClientRequest.emit (events.js:211:7)
25
26at Socket.socketErrorListener (_http_client.js:387:9)

補足情報（FW/ツールのバージョンなど）

npm-v :5.6.0

yarn-v :1.5.1

os -v :10.12.6

下記package.jsonの中身になります。

package.json

{   "name": "my-react-todolist",   "version": "0.1.0",   "private": true,   "dependencies": {
    "chrome": "^0.1.0",
    "eslint-plugin-flowtype": "^2.46.1",
    "jest-cli": "^22.4.3",
    "react": "^15.6.1",
    "react-dom": "^15.6.1",
    "selenium": "^2.20.0",
    "v": "^0.3.0",
    "webdriver.js": "^0.1.0",
    "webdriverjs": "^1.7.5"   },


    "devDependencies": {
        "chai": "^4.1.2",
        "enzyme": "^2.9.1",
        "eslint": "^3.19.0",
        "eslint-config-airbnb": "^15.0.1",
        "eslint-plugin-import": "^2.6.1",
        "eslint-plugin-jsx-a11y": "^5.1.0",
        "eslint-plugin-react": "^7.1.0",
        "react-scripts": "1.0.7",
        "react-test-renderer": "^15.6.1",
        "selenium-standalone": "^6.5.0",
        "wdio-dot-reporter": "0.0.8",
        "wdio-mocha-framework": "^0.5.13",
        "wdio-selenium-standalone-service": "0.0.9",
        "webdriverio": "^4.8.0"   },


    "scripts": {
        "selenium-setup": "selenium-standalone install",
        "selenium-start": "selenium-standalone start",
        "e2e-tests": "wdio",
        "e2e-tests-watch": "wdio wdio.conf.js --watch",
        "start": "react-scripts start",
        "build": "react-scripts build",
        "test": "react-scripts test --env=jsdom",
        "eject": "react-scripts eject",
          "start":"selenium-standalone start",      "selenium": "selenium-standalone",   } }

ここにより詳細な情報を記載してください。