反应测试玩笑“不变违规：元素类型无效：预期为字符串……”

Question

测试套件无法运行

Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

我的utils.test.js

npm测试src / utils / tests / utils.test.js

import { fixedZero } from '../utils';

// fixedZero test
describe('utils', () => {
  it('fixedZero', () => {
    expect(fixedZero(0)).toBe('00');
    expect(fixedZero(5)).toBe('05');
    expect(fixedZero(10)).toBe(10);
    expect(fixedZero(55)).toBe(55);
  });
});

在utils.js中，我从index.js中导入了一些东西

import store from '../index';

我的index.js，它在浏览器中可以正常工作，但是当我运行测试时，它没有通过

import '@babel/polyfill';
import 'formdata-polyfill';
import 'url-polyfill';
import dva from 'dva';
import createHistory from 'history/createBrowserHistory';
import createLoading from 'dva-loading';
import 'moment/locale/zh-cn';
import './rollbar';
import './zhuge';

import './index.less';
const app = dva({
  history: createHistory({
    basename: '',
  }),
});
app.use(createLoading());
app.model(require('./models/global').default);
app.router(require('./router').default);
app.start('#root');

export default app._store;