反应烟雾测试期间抛出的"缺少cookie头或对象"错误(Create-react-app)

Question

我universal-cookie用来存储在本地存储中,然后通过管道传输到商店.

class App extends Component {

  componentDidMount() {
    // if a cookie is present, save the value in the store for use communication 
    // with the server. If the cookie is undefined, the user is redirected to the login page.
    // Redirection is handled by router.
    const userNameInCookie = cookies.get('userName');
    if (userNameInCookie) {
        this.props.dispatch(actions.setUserNameFromCookie(userNameInCookie));
    }
  }

  render() {
    return (
        <div>
            <div className="header">
                <h2 className="header-title">Traveler</h2>
            </div>
            {this.props.children}
        </div>
    );
  }
}

当我运行Jest测试套件时,每次测试都会因此错误而失败

FAIL  src/test/UserCreateForm.test.js
? Test suite failed to run

Missing the cookie header or object

  at new Cookies (node_modules/universal-cookie/lib/Cookies.js:35:15)
  at Object.<anonymous> (src/actions/index.js:4:17)
  at Object.<anonymous> (src/reducers/index.js:1:258)
  at Object.<anonymous> (src/store.js:4:40)
  at Object.<anonymous> (src/test/UserCreateForm.test.js:7:40)
  at handle (node_modules/worker-farm/lib/child/index.js:41:8)
  at process.<anonymous> (node_modules/worker-farm/lib/child/index.js:47:3)
  at emitTwo (events.js:106:13)
  at process.emit (events.js:194:7)
  at process.nextTick (internal/child_process.js:766:12)
  at _combinedTickCallback (internal/process/next_tick.js:73:7)
  at process._tickCallback (internal/process/next_tick.js:104:9)

我也试过用酶进行烟雾测试,但是我得到了同样的错误.代码的行为完全符合我的要求,因此我认为这universal-cookie与测试无关.

有任何想法吗？谢谢!

Answer 1

你导入了universal-cookie然后定义了类吗？

import Cookies from 'universal-cookie';
const cookies = new Cookies();

所以你的代码看起来是......

import Cookies from 'universal-cookie';

class App extends Component {
  componentDidMount() {
    const cookies = new Cookies();
    const userNameInCookie = cookies.get('userName');
    if (userNameInCookie) {
      this.props.dispatch(actions.setUserNameFromCookie(userNameInCookie));
    }
  }

  render() {
    return (
      <div>
        <div className="header">
          <h2 className="header-title">Traveler</h2>
        </div>
        {this.props.children}
      </div>
    );
  }
}