我在 React-Redux 连接组件测试中遇到了麻烦。我想用异步操作测试这个组件,但在控制台中我总是收到错误...我使用 React-testing-library 和 jest 进行测试(不是酶)。
控制台出错
expect(jest.fn()).toHaveBeenCalledWith(...expected)
Expected: [Function anonymous]
Received: [Function anonymous]
Number of calls: 1
45 | it('should dispatch an action on page first render',() => {
46 | expect(store.dispatch).toHaveBeenCalledTimes(1);
> 47 | expect(store.dispatch).toHaveBeenCalledWith(fetchTop10());
| ^
48 | });
49 | });
50 |<br /><br />
有连接组件“CardList.js”
import React,{ Fragment,useEffect } from 'react';
import PropTypes from 'prop-types';
import { Link } from 'react-router-dom';
// Redux
import { connect } from 'react-redux';
// actions
import { fetchTop10 } from '../../actions/fetchTitles'; // async api call with data response
// Utils
import CardItem from './CardItem';
const CardList = ({ fetchTop10,top10 }) => {
useEffect(() => {
(async () => {
await fetchTop10();
})();
},[fetchTop10]);
const renderCards = () => {
if (top10.length === 0) { // This is for sceletion insted of spinner
return [1,2,3,4,5,6,7,8,9,10].map((el) => {
return <CardItem key={el} />;
});
}
return top10.map((title) => { // actual data from action API call
return <CardItem key={title.id} title={title} />;
});
};
return (
<Fragment>
<section id="section-top" classname="section-top">
<h3 classname="section-top__heading">Week Bestlers</h3>
<div classname="top-cards">{renderCards()}</div>
<Link to="/titles" classname="section-top__btn btn-link">
view more →
</Link>
</section>
</Fragment>
);
};
CardList.propTypes = {
fetchTop10: PropTypes.func.isrequired,top10: PropTypes.array.isrequired,};
const mapstatetoProps = (state) => {
return { top10: state.top10 };
};
export default connect(mapstatetoProps,{ fetchTop10 })(CardList);<br /><br />
测试“CardList.test.js”
import { render,cleanup } from '@testing-library/react';
import '@testing-library/jest-dom';
import '@testing-library/jest-dom/extend-expect';
import React from 'react';
import { Provider } from 'react-redux';
import { Router } from 'react-router-dom'; // All project components are in global Router
import thunk from 'redux-thunk';
import configureStore from 'redux-mock-store'; // for provider store
// Component
import CardList from '../CardList';
// Objects
import { fakeTitle,fakeTitle2 } from '../../utils/UserTitleObjects'; // Just objects with data
import history from '../../../history';
import { fetchTop10 } from '../../../actions/fetchTitles'; // action with API call
const mockStore = configureStore([thunk]);
describe('My Connected React-Redux Component',() => {
let store,component;
beforeEach(() => {
store = mockStore({
top10: [],});
store.dispatch = jest.fn();
component = render(
<Provider store={store}>
<Router history={history}>
<CardList />
</Router>
</Provider>
);
});
afterEach(cleanup);
it('should render with given state from Redux store',() => {
expect(component.baseElement.querySelectorAll('.sceletion').length).toBe(
60
);
});
it('should dispatch an action on page first render',() => {
expect(store.dispatch).toHaveBeenCalledTimes(1); // this is good <--
expect(store.dispatch).toHaveBeenCalledWith(fetchTop10()); // Here starts a problem
});
});