moment-timezone.js - 在Jest Test

时间:2017-12-12 11:58:06

标签: javascript reactjs timezone jestjs momentjs

我使用moment-timezone.js收到错误消息。它在网页上运行完美,但是当我尝试为它实现测试时,测试结果总是会返回如下错误。

这是我在网页上使用的代码:

import moment from 'moment-timezone';

class TimezoneCityItem extends React.Component {

  componentDidMount(){
    this.setState({
      time: moment.tz(this.props.timezone)
    })
  }

  render(){
    return (
      <div>{this.state.time.format('HH:mm')}</div>
    )
  }
}

这是timezoneListDummyData

const timezoneList = [
  { name: 'los-angeles', title: 'Los Angeles', timezone: 'America/Los_Angeles' },
  { name: 'washington', title: 'Washington', timezone: 'America/New_York' },
  { name: 'london', title: 'London', timezone: 'Europe/London' },
  { name: 'dubai', title: 'Dubai', timezone: 'Asia/Dubai' },
  { name: 'hongkong', title: 'Hongkong', timezone: 'Asia/Hong_Kong' },
];

export default timezoneList;

这是我在测试文件中使用的代码

import React from 'react';
import { shallow } from 'enzyme';
import TimezoneCityItem from '../TimezoneCity.item';
import timezoneList from '/lib/timezoneListDummyData'; // It just an array list of timezone

describe('<TimezoneCityItem />', () => {
   test('Should render TimezoneCityItem correctly', () => {
       const wrapper = shallow(<TimezoneCityItem {...timezoneList[0]} />);
       expect(wrapper).toMatchSnapshot();
   });
});

这是包的版本:

"moment": "~2.18.1",
"moment-timezone": "~0.5.13",

这是错误消息:

Test suite failed to run
TypeError: Cannot read property 'split' of undefined

  at node_modules/moment-timezone/moment-timezone.js:36:34
  at Object.<anonymous>.moment (node_modules/moment-timezone/moment-timezone.js:14:20)
  at Object.<anonymous> (node_modules/moment-timezone/moment-timezone.js:18:2)
  at Object.<anonymous> (node_modules/moment-timezone/index.js:1:120)
  at Object.<anonymous> (imports/ui/components/mainLayout/TimezoneCity.item.jsx:3:49)
  at Object.<anonymous> (imports/ui/components/mainLayout/TimezoneCity.jsx:3:47)
  at Object.<anonymous> (imports/ui/components/mainLayout/MainLayout.jsx:6:47)
  at Object.<anonymous> (imports/ui/components/mainLayout/__tests__/MainLayout.test.js:3:19)
      at Generator.next (<anonymous>)
      at new Promise (<anonymous>)
      at Generator.next (<anonymous>)
      at <anonymous>

2 个答案:

答案 0 :(得分:0)

为此可能要晚一点,但是为了他人的利益。我们之所以会收到此消息,是因为moment-timezone希望使用moment包中的版本号。

如在time-timezone.js上看到的

	var momentVersion = moment.version.split('.'),
		major = +momentVersion[0],
		minor = +momentVersion[1];

当您开玩笑时,它会尝试模拟您包含的所有内容,因此瞬间就被模拟了。由于排除了属性,因此仅对函数进行了模拟,您将不得不取消模拟momentmoment-timezone或在模拟的moment对象中包含伪造的版本号。

答案 1 :(得分:-1)

我遇到了同样的问题;这是我如何嘲笑瞬间的一个例子:

let diffMins = updateThreshold + 1;
jest.mock('moment', () => {
  const mMoment = {
    diff: jest.fn(() => diffMins),
  };
  const fn = jest.fn(() => mMoment);
  fn.version = '2.24';
  fn.tz = jest.fn();
  fn.fn = jest.fn();
  return fn;
});