Question

自3天以来，我是测试和搜索领域的新手，如何解决我的问题。希望你能帮助我.. 我有一个父组件：

import React from 'react';
import './Subscribe.scss';
import Button from '../../Components/Button/Button';

class Subscribe extends React.Component {
    state = {
        user: {
            firstName: '',
            pseudo:'',
            email: '',
            password:''
        }
    }

handleChange = (e) => {
    this.setState({
        user: {...this.state.user, [e.target.name]: e.target.value}
    }, () => console.log(this.state))
}

onSubmit = (e) => {
    //  e.preventDefault()
    console.log("you've clicked")
    //todo
}
    render() {
        return(
            <form className='subscribe' id='subscriptionForm'>
                <label htmlFor='firstName'>Prénom :</label>
                    <input
                        data-testid='inputString'
                        type='text'
                        name='firstName'
                        onChange={this.handleChange}
                        value={this.state.user.firstName}
                    />

                <label htmlFor='pseudo'>Pseudo :</label>
                    <input
                        data-testid='inputString'
                        type='text'
                        name='pseudo'
                        onChange={this.handleChange}
                        value={this.state.user.pseudo}
                    />
                <label htmlFor='email'>Email :</label>
                    <input
                        data-testid='inputString'
                        type='email'
                        name='email'
                        onChange={this.handleChange}
                        value={this.state.user.email}
                    />
                <label htmlFor='password'>
                    password :
                </label>
                <Button id='submitSubscription' text='Go go !' onSubmit={this.onSubmit}/>
                <Button text='Annuler'/>
            </form>
        )
    }
}

export default Subscribe;

一个子组件：

import React from "react";

const Button = (props) => {
    return (
        <button type="button" onClick={props.onClick}>{props.text}</button>
    )
}
Button.displayName = 'Button'
export default Button

我想测试一下，但是没有用...

我的测试：


import React from 'react';
import { shallow, mount } from 'enzyme';
import Subscribe from './Subscribe.js';
import Button from "./../../Components/Button/button.js"


describe('<LogIn />', () => {
    it('Should call onSubmit on subscribe component when button component is clicked and allow user to subscribe ', () => {
        // Rend le composant et les enfants et renvoie un wrapper Enzyme
        const wrapper = mount(<Subscribe />);
        // Trouve la première balise bouton
        const button = wrapper.find("#submitSubscription");
        // Récupère l'instance React du composant
        const instance = wrapper.instance();
        // Ecoute les appels à la fonction on Submit
        jest.spyOn(instance, "onSubmit");
        button.simulate('click');
        expect(instance.onSubmit).toHaveBeenCalled();
    })

评论是我尝试过的。答案仍然是Expected number of calls: >= 1 Received number of calls: 0 我也愿意通过反应测试来尝试，因此我开始尝试任何帮助。

谢谢！

Answer 1

您的表单设置有一些错误。主要是，您需要在handleSubmit的{{1}}道具上放置一个form并更改其中一个按钮以使onSubmit的{{1}}道具。请查看有效版本的代码和框：

工作示例（您可以通过点击type标签旁边的submit标签来运行测试）

此示例使用了一些es6 syntax，因此，如果您不熟悉，请阅读以下内容：

components / Button / Button.js

Tests

components / Subscribe / Subcribe.js

Browser

components / Subscribe / __ tests __ / Subscribe.test.js （我正在传递import React from "react"; const Button = props => ( <button style={{ marginRight: 10 }} type={props.type || "button"} onClick={props.onClick} > {props.text} </button> ); Button.displayName = "Button"; export default Button;道具来模拟它，我希望它会被调用。这是更常见的测试用例与对React的事件回调实现进行测试（迫使您不必要地监视类字段）通过对import React, { Component } from "react"; import Button from "../Button/Button"; // import './Subscribe.scss'; const initialState = { user: { firstName: "", pseudo: "", email: "", password: "" } }; class Subscribe extends Component { state = initialState; handleChange = ({ target: { name, value } }) => { // when spreading out previous state, use a callback function // as the first parameter to setState // this ensures state is in sync since setState is an asynchronous function this.setState( prevState => ({ ...prevState, user: { ...prevState.user, [name]: value } }), () => console.log(this.state) ); }; handleCancel = () => { this.setState(initialState); }; handleSubmit = e => { e.preventDefault(); this.props.onSubmit(this.state); }; render = () => ( <form onSubmit={this.handleSubmit} className="subscribe" id="subscriptionForm" > <label htmlFor="firstName">Prénom :</label> <input data-testid="inputString" type="text" name="firstName" onChange={this.handleChange} value={this.state.user.firstName} /> <br /> <label htmlFor="pseudo">Pseudo :</label> <input data-testid="inputString" type="text" name="pseudo" onChange={this.handleChange} value={this.state.user.pseudo} /> <br /> <label htmlFor="email">Email :</label> <input data-testid="inputString" type="email" name="email" onChange={this.handleChange} value={this.state.user.email} /> <br /> <label htmlFor="password">password :</label> <input data-testid="inputString" type="password" name="password" onChange={this.handleChange} value={this.state.user.password} /> <br /> <br /> <Button type="button" text="Annuler" onClick={this.handleCancel} /> <Button id="submitSubscription" type="submit" text="Soumettre" /> </form> ); } export default Subscribe;（或状态更改或某些辅助操作）进行测试，我们已经涵盖了回调是否有效！）

onSubmit

index.js

prop

测试父组件中子组件的按钮

1 个答案: