React 测试库快照测试无法读取存储属性

问题描述

我正在尝试为一个组件创建一个快照测试，但是，我的商店不断出现未定义，我不知道为什么。我需要向我的商店传递什么才能使其正确？我已经对其他不需要 mapStatetoProps 或 withRouter 的组件进行了快照测试，之前没有任何问题。

WorkflowForm.jsx

const mapStatetoProps = (state,ownProps) => {
  return {
    ...ownProps,userID: state.data.userID,userObj: state.ui.userObj
  };
};

export default withRouter(
  connect(mapStatetoProps,null)(WorkflowForm)
);

WorkflowForm.test.jsx

import React from 'react';
import renderer from 'react-test-renderer';
import { Provider } from 'react-redux';
import { browserRouter } from "react-router-dom";
import  WorkflowForm from "../WorkflowForm";
import { cleanup } from '@testing-library/react';
import configureMockStore from 'redux-mock-store';

afterEach(cleanup);

const mockStore = configureMockStore();
const store = mockStore({
  userID: "121",userObj: "Name"
});

describe('Test suits for WorkflowForm',() => {
  it('should match with snapshot',() => {
    const tree = renderer
      .create(
        <Provider store={store}>
          <browserRouter>
            <WorkflowForm />
          </browserRouter>
        </Provider>
      )
      .toJSON();
    expect(tree).toMatchSnapshot();
   });
});

这是我运行测试时得到的错误

TypeError: Cannot read property 'userID' of undefined

      392 |   return {
      393 |     ...ownProps,> 394 |     userID: state.data.userID,|                        ^
      395 |     userObj: state.ui.userObj
      396 |   };
      397 | };

解决方法

您没有正确地向模拟商店提供 state。应该是：

const store = mockStore({
  data: { userID: '121' },ui: { userObj: 'Name' },});