import React from 'react'; import { render, fireEvent, screen } from '@testing-library/react'; import { perf, wait } from 'react-performance-testing'; test('countボタンをクリックした時に、2回レンダリングする', async () => { const Button = ({ name, onClick }) => ( <button type="button" onClick={onClick}>{name}</button> ); const Counter = () => { const [count, setCount] = React.useState(0); return ( <div> <span>{count}</
![Reactでレンダリング回数やレンダリングにかかる時間をユニットテストでテストできるライブラリを開発しました - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/b46ec6d2aed17ae21ee709ce5f6941280ed1768b/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-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%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBrZWl5YTAxJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz05NzI2MzczNGZhODkyYTFmZjk3NjViMTgyN2QxMDQ5Mw%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3Ddb02300bcbd4b3d25a6e6683c69337ab)