React-Redux Connected Component 测试正确操作已在点击事件上分派

Question

我是使用 jest 和酶测试 react-redux 组件的新手，到目前为止，我发现这是一个挑战。

我有一个登录页面，我想测试如果单击登录按钮后登录失败，是否会发送正确的错误操作。

这就是我测试连接组件的方式，

require('../jsDomSetup');
import React from 'react';
import { Provider } from 'react-redux';
import loginDefault, {Login}  from '../../app/routes/Login/LoginContainer';
import {mount, shallow} from 'enzyme';
import loginActions from '../../app/redux/actions/loginActions';
import thunk from 'redux-thunk';
import configureMockStore from 'redux-mock-store';
import nock from 'nock';

describe("login container component", function(){

 afterEach(() => {
   nock.cleanAll();
 });

test("loginFailure action is called when login failed due to no crendetials", () =>{
  nock('http://192.168.0.2:3000')
  .get('/graphql?prettify=true')
  .replyWithError('login failed');

    // Error message: Incorrect username and password please try again
    const mockStore = configureMockStore([thunk]);
    const store = mockStore();
    const output = mount(<Provider store={store}><loginDefault></loginDefault></Provider>)
    let loginButton = output.ref('loginButton');
    expect(store.getActions().length).toBe(0);
    loginButton.simulate('click');
    expect(store.getActions().length).toBe(1);
});

在我运行此测试时，尝试模拟单击时失败，找不到按钮元素。但是这个 ref 存在，当我尝试像按钮这样的简单搜索时，它仍然找不到任何按钮。所以我假设安装正在返回一些无提示的错误或其他东西。

我只想检查登录失败时是否调用了正确的操作。

如何让这个测试通过？

Answer 1

你快到了，这对我有用。
例如

test("loginFailure action is called when login failed due to no crendetials", () =>{
    nock('http://192.168.0.2:3000')
  	.get('/graphql?prettify=true')
	.replyWithError('login failed');

    // Error message: Incorrect username and password please try again
    const mockStore = configureMockStore([thunk]);
    const store = mockStore();

    const withProvider = (
            <Provider store={store}>
                <loginDefault />
            </Provider>
        );

    const wrapper = mount(withProvider);
    let loginButton = wrapper.find('button'); //here you can use other selector like #myButton or .btn, but be sure it can find it.
    loginButton.simulate('click');
    
    const unsubscribe = store.subscribe(() => {	    
                    const actions = store.getActions();
		    //here your expectation after the action is raised
                    expect(actions.length).to.have.length.above(0);
                });

    expect(store.getActions().length).toBe(0);    

});

希望对您有所帮助。