Reactjs 如何测试是否调用了handleClick?
我有以下功能组件:Reactjs 如何测试是否调用了handleClick?,reactjs,testing,jestjs,Reactjs,Testing,Jestjs,我有以下功能组件: import React, { useState } from 'react'; import logo from './logo.svg'; import './App.css'; export function App() { const [item, setItem] = useState(false); function handleChange(e) { console.log(e.target.value); } function h
import React, { useState } from 'react';
import logo from './logo.svg';
import './App.css';
export function App() {
const [item, setItem] = useState(false);
function handleChange(e) {
console.log(e.target.value);
}
function handleClick() {
setItem(!item);
}
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<p>
Edit <code>src/App.js</code> and save to reload.
</p>
<a
className="App-link"
href="https://reactjs.org"
target="_blank"
rel="noopener noreferrer"
>
Learn React
</a>
{item && <div id="saludo">hola</div>}
<select
name="select"
id="selector"
defaultValue="value2"
onChange={handleChange}
>
<option value="value1">Value 1</option>
<option value="value2">Value 2</option>
<option value="value3">Value 3</option>
</select>
<button onClick={handleClick}>I'm a button</button>
</header>
</div>
);
}
export default App;
我有以下测试:
import React from 'react';
import { render, unmountComponentAtNode } from 'react-dom';
import { act, Simulate } from 'react-dom/test-utils';
import App from './App';
describe('test', () => {
let container = null;
beforeEach(() => {
// setup a DOM element as a render target
container = document.createElement('div');
document.body.appendChild(container);
});
afterEach(() => {
// cleanup on exiting
unmountComponentAtNode(container);
container.remove();
container = null;
});
it('renders without crashing', () => {
const div = document.createElement('div');
render(<App />, div);
unmountComponentAtNode(div);
});
it('various test', () => {
act(() => {
render(<App />, container);
});
const button = container.querySelector('button');
act(() => {
Simulate.click(button);
});
let element = document.getElementById('saludo');
expect(element.innerHTML).toBe('hola');
act(() => {
Simulate.click(button);
});
element = document.getElementById('saludo');
expect(element).toBeNull();
let selector = document.getElementById('selector');
expect(selector.value).toBe('value2');
selector.value = 'value3';
Simulate.change(selector);
expect(selector.value).toBe('value3');
});
});
从“React”导入React;
从“react dom”导入{render,unmountComponentAtNode};
从'react dom/test utils'导入{act,Simulate};
从“./App”导入应用程序;
描述('测试',()=>{
让container=null;
在每个之前(()=>{
//将DOM元素设置为渲染目标
container=document.createElement('div');
文件.正文.附件(容器);
});
之后(()=>{
//退出时的清理
卸载组件节点(容器);
容器。移除();
container=null;
});
它('渲染而不崩溃',()=>{
const div=document.createElement('div');
渲染(,div);
卸载组件节点(div);
});
它('各种测试',()=>{
行动(()=>{
渲染(,容器);
});
const button=container.querySelector('button');
行动(()=>{
模拟。点击(按钮);
});
let element=document.getElementById('saludo');
expect(element.innerHTML).toBe('hola');
行动(()=>{
模拟。点击(按钮);
});
元素=document.getElementById('saludo');
expect(element.toBeNull();
让选择器=document.getElementById('selector');
expect(selector.value).toBe('value2');
selector.value='value3';
模拟。改变(选择器);
expect(selector.value).toBe('value3');
});
});
但是现在我想测试内部函数和状态,但是找不到一种方法来测试hanldeChange是否已被调用 您正在测试由
expect(element).toBeNull()的语句触发的单击的效果代码>和expect(element.innerHTML).toBe('hola')代码>单击设置确定该元素存在的状态值。