反应&Jest,如何测试更改状态并检查另一个组件 [英] React & Jest, how to test changing state and checking for another component
问题描述
在我的代码的最后一部分中,我也尝试过,但无济于事
loginComponent.setState({错误:正确},expect(ReactTestUtils.isElement(notificationComponent)).toBe(true));
https://facebook.github.io/react/docs/test-utils.html
我的登录组件的 render()
render() {const usernameError = this.state.username.error;const 错误 = this.state.error;const errorMsg = this.state.errorMsg;返回 (<div className="app-bg">{ 错误 &&<通知消息={ errorMsg } closeMsg={ this.closeMessage }/>}<section id="auth-section"><标题><img src="static/imgs/logo.png"/><h1>标语</h1></标题>
在将state.error设置为true后,也尝试了这个方法来测试Notification组件
it('如果 state.error 为真,应该渲染 Notification 组件', () => {const loginComponent = ReactTestUtils.renderIntoDocument(<登录/>);const notificationComponent = ReactTestUtils.renderIntoDocument(<通知/>);//登录组件.setState({//错误:真//}, expect(ReactTestUtils.isDOMComponent(notificationComponent)).toBe(true));const checkForNotification = () =>{const 登录 = 浅(<登录/>);期望(登录.查找(通知).长度).toBe(1);};loginComponent.setState({错误:正确}, checkForNotification());});
但那个测试也失败了.
也试过const login = mount(
还有其他人在使用 Jest 和 React Test Utilities 时遇到问题吗?
想通了!不需要 React 测试工具
it('如果 state.error 为真,应该渲染 Notification 组件', () => {const loginComponent = 浅(<登录/>);loginComponent.setState({ error: true });期望(登录组件.查找(通知).长度).toBe(1);});
这会将 Login 组件中的错误状态设置为 true,然后检查 Login 组件是否包含 Notification 组件.
I have a Login component which will display a Notification component if this.state.error
is true.
I'm now writing a Jest test to test this.
import React from 'react'
import ReactTestUtils from 'react-dom/test-utils';
import { shallow } from 'enzyme'
import toJson from 'enzyme-to-json'
import Login from './Login'
import Notification from '../common/Notification'
describe('<Login /> component', () => {
it('should render', () => {
const loginComponent = shallow(<Login />);
const tree = toJson(loginComponent);
expect(tree).toMatchSnapshot();
});
it('should contains the words "Forgot Password"', () => {
const loginComponent = shallow(<Login />);
expect(loginComponent.contains('Forgot Password')).toBe(true);
});
// This test fails
it('should render the Notification component if state.error is true', () => {
const loginComponent = ReactTestUtils.renderIntoDocument(
<Login />
);
const notificationComponent = ReactTestUtils.renderIntoDocument(
<Notification />
);
loginComponent.setState({
error: true
}, expect(ReactTestUtils.isDOMComponent(notificationComponent)).toBe(true));
});
});
However currently the test is failing, and I'm not sure why
In the last part of my code I've also tried this to no avail
loginComponent.setState({
error: true
}, expect(ReactTestUtils. isElement(notificationComponent)).toBe(true));
https://facebook.github.io/react/docs/test-utils.html
The render() of my Login component
render() {
const usernameError = this.state.username.error;
const error = this.state.error;
const errorMsg = this.state.errorMsg;
return (
<div className="app-bg">
{ error &&
<Notification message={ errorMsg } closeMsg={ this.closeMessage }/>
}
<section id="auth-section">
<header>
<img src="static/imgs/logo.png"/>
<h1>tagline</h1>
</header>
Also tried this method for testing for the Notification component after setting state.error to true
it('should render the Notification component if state.error is true', () => {
const loginComponent = ReactTestUtils.renderIntoDocument(
<Login />
);
const notificationComponent = ReactTestUtils.renderIntoDocument(
<Notification />
);
// loginComponent.setState({
// error: true
// }, expect(ReactTestUtils.isDOMComponent(notificationComponent)).toBe(true));
const checkForNotification = () => {
const login = shallow(<Login />);
expect(login.find(Notification).length).toBe(1);
};
loginComponent.setState({
error: true
}, checkForNotification());
});
But that test also failed.
Also tried const login = mount(<Login />);
Anyone else running into a problem using Jest and the React Test Utilities?
Figured it out! Did not need React Test Utilities
it('should render the Notification component if state.error is true', () => {
const loginComponent = shallow(<Login />);
loginComponent.setState({ error: true });
expect(loginComponent.find(Notification).length).toBe(1);
});
This will set the state of error to true in the Login component, then check if the Login component contains the Notification component.
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