如何使用 jest 模拟 react-router-dom 的 BrowserRouter

Question

我有这个呈现应用程序路由的组件：https://jsbin.com/bahaxudijo/edit?js，我正在尝试模拟 BrowserRouter 和 Route 来进行测试，这是我的测试：

import React from 'react';
import renderer from 'react-test-renderer';

import Router from '../../../components/Router/Component';

jest.mock('react-router-dom', () => ({
  BrowserRouter: ({ children }) => <div>{children}</div>,
  Route: ({ children }) => <div>{children}</div>,
}));

jest.mock('../../../components/Nav/index', () => '<MockedNav />');
jest.mock('../../../components/ScheduleManager/index', () => '<MockedScheduleManager />');

const props = {
  token: '',
  loginStaff: jest.fn(),
};

describe('<Router />', () => {
  describe('When is passed a token', () => {
    it('renders the correct route', () => {
      const component = renderer.create(<Router {...props} />);
      expect(component).toMatchSnapshot();
    });
  });
});

但是我在嘲笑 BrowserRouter 和 Route 是错误的，所以测试通过了，但快照只是空的 div。如何正确模拟 BrowserRouter 和路由？

Answer 1

jest.mock('react-router-dom', () => {
  // Require the original module to not be mocked...
  const originalModule = jest.requireActual('react-router-dom');

  return {
    __esModule: true,
    ...originalModule,
    // add your noops here
    useParams: jest.fn(),
    useHistory: jest.fn(),
  };
});