如何使用jest和酶进行redux-saga组合测试

module.exports = {
  setupFilesAfterEnv: ['<rootDir>/setupTests.js'],
  testEnvironment: 'enzyme',
  moduleNameMapper: {
    '\\.(css|less)$': 'identity-obj-proxy',
  },
};

import Enzyme from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

Enzyme.configure({ adapter: new Adapter() });

import React from 'react';
import { shallow } from 'enzyme';
import { put } from 'redux-saga/effects';
import { fetchData } from './sagas';
import { FETCH_DATA_SUCCESS } from './actions';
import MyComponent from './MyComponent';

describe('fetchData saga', () => {
  it('should dispatch FETCH_DATA_SUCCESS action with data', () => {
    const data = { id: 1, name: 'John Doe' };
    const gen = fetchData();

    expect(gen.next().value).toEqual(put({ type: FETCH_DATA_SUCCESS, payload: data }));
    expect(gen.next().done).toBeTruthy();
  });
});

describe('MyComponent', () => {
  it('should render correctly', () => {
    const wrapper = shallow(<MyComponent />);
    expect(wrapper).toMatchSnapshot();
  });
});