Question

我对Jest和Java Script还是陌生的。我对其中一个组件进行了测试，但似乎失败了，我无法弄清楚如何修复以及出了什么问题（显然是酶的作用）。

它打印：

● Console

    console.log src/App.js:18
      props = {}
    console.log src/App.js:19
      url = ./api/user/undefined/

C:\Users\Itay\Documents\Matan - Microsoft\Matan\MatanClient\node_modules\react-dom\cjs\react-dom.development.js:62
    throw error;
    ^

Invariant Violation: The `document` global was defined when React was 
initialized, but is not defined anymore. This can happen in a test 
environment if a component schedules an update from an asynchronous 
callback, but the test has already finished running. To solve this, you can 
either unmount the component at the end of your test (and ensure that any 
asynchronous operations get canceled in `componentWillUnmount`), or you can 
change the test itself to be asynchronous.

我编写的测试非常简单：

import React from 'react';
import PropTypes from 'prop-types';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';
import { AdminViewComponent } from '../components/AdminViewComponent.js';

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

describe('<AdminViewComponent />', () => {
  it('renders an admin view', () => {
  const admin = shallow(<AdminViewComponent />);
  expect(admin.render()).toBeCalled;
  });
});

组件本身看起来像这样：

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import {Typeahead} from 'react-bootstrap-typeahead'; // ES2015
import axios from 'axios';
import {WholeScreen} from './WholeScreenComponent.js';

export class AdminViewComponent extends Component{

  constructor(props) {
    super(props);

    this.state = {
      emailList: [],
      selectedUser: "",
      SelectedUserDonationData:{}
    };

    this._handleChange = this._handleChange.bind(this);
  }

 getInitialState(){
    return {
      // [{}] is weird, either use undefined (or [] but undefined is better).
      // If you use [], you loose the information of a "pending" request, as 
      // you won't be able to make a distinction between a pending request, 
      // and a response that returns an empty array
      emailList: undefined,
      selectedUser: undefined,
      SelectedUserDonationData:undefined
    } 
  }
  componentDidMount(){
    this.setState({emailList : undefined});
    return axios.get('./api/user/', {
        headers: {
            'Content-Type': 'application/json',
            'Authorization': 'Bearer '+ this.props.token
        }
        }).then(response => {
            const emailListResult = response.data;
            this.setState({ emailList : emailListResult });

        }).catch(function (error) {
              console.log(error);
        });
  }

  _handleChange(SelectedUser){
     this.setState({ selectedUser : SelectedUser, selectedUserDonationData: undefined });


    axios.get('./api/user/' + SelectedUser + '/' , 
       {headers: {
            'Content-Type': 'application/json',
            'Authorization': 'Bearer '+ this.props.token
        }
        }).then(response => {
            const selectedUserDonationDataResponse = response.data;
            this.setState({ selectedUserDonationData : selectedUserDonationDataResponse });
            console.log(selectedUserDonationDataResponse);

        }).catch(function (error) {
              console.log(error);
        });

  }

    render() {
      var adminView;
      if (!this.state.emailList){
        adminView = <div> Please wait while we retrive all users... </div>
      }
      else{
        adminView =<div> <div> Please select user to show his/her donations </div>        
                    <Typeahead 
                      placeholder="Select user email..."
                      onChange={this._handleChange}
                      options={this.state.emailList}/> </div>;
      }

      var selectedUserData;
      if (this.state.selectedUserDonationData){

        selectedUserData = <div className="AdminViewData"> 
                          <h4 className="DtatOf">Showing donations of : {this.state.selectedUser}</h4>
                              <WholeScreen  data={this.state.selectedUserDonationData.DonationsList}/>
                        </div>
      }

      var url = "./api/user/" ; 
      return(
      <div className="AdminView">

          {adminView}              
          {selectedUserData}

      </div>          
      );
    }
}

谢谢前进！

Answer 1

我相信您的浅色渲染器导入应如下所示：

import { shallow, configure  } from 'enzyme';

编辑：您能否在浅层渲染器下面添加以下导入和初始化。

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

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

也如酶文档中所述：enzyme installation

使用Jest测试组件失败

1 个答案: