npm install --save-dev jest react-test-renderer 步骤2:创建测试文件在与被测试组件相同的目录下创建一个__tests__文件夹,并在其中创建一个以.test.js或.spec.js结尾的文件,例如MyComponent.test.js。 步骤3:编写测试用例在测试文件中,使用Jest提供的test函数来编写测试用例。例如,测试一个名为MyComponent的R...
// Counter.test.js import { render, screen, fireEvent } from '@testing-library/react'; import Counter from './Counter'; test('counter increments when button is clicked', () => { // Render the Counter component render(<Counter />); // Get the button and paragraph elements const ...
If you have a component that makes HTTP requests, you’ll probably want to mock those out for UI unit and integration tests. Let’s see how to use jest’s built-in mocking capabilities to do that. Component: import Reactfrom'react'import { loadGreeting }from'./api'function GreetingLoader...
要使用Jest和React Testing Library进行React组件的单元测试,首先需要安装这两个库: npm install--save-devjest@testing-library/react@testing-library/jest-dom AI代码助手复制代码 接下来,创建一个测试文件,命名为Component.test.js,并编写测试用例。以下是一个示例测试用例: importReactfrom'react';import{ render,...
expect(wrapper.find('.ReactCodeMirror')).toHaveLength(0); wrapper.find('button').simulate('click'); expect(wrapper.find('.ReactCodeMirror')).toHaveLength(1); }); Testing event handlers Similar to events testing but instead of testing component’s rendered output with a snapshot use Jest’...
There are some situations where you want to focus your tests on a particular component and not any of its children. There are other situations where you want to mock out the behavior of components that your component renders. In the case of react-transition-group, we don’t want to have ...
在React中,componentDidMount生命周期方法会在组件挂载后立即调用。这个方法通常被用于发送异步请求,例如使用axios库发送GET请求。 在使用jest进行测试时,我们可以模拟axios库的get方法,并且测试componentDidMount中的请求是否被调用。 首先,我们需要安装所需的依赖,包括axios和jest: 代码语言:txt 复制 npm install a...
本文简单介绍了 react-test-renderer 和react-dom/test-utils 两兄弟以及 Enzyme。具体在项目中选择哪一款工具根据自己喜好选择即可。 本文中全部代码均可在 loveky/unit-testing-react-component 仓库中获取。 链接 Test Renderer - Reactreactjs.org/docs/test-renderer.html Test Utilities - Reactreactjs....
If you have a component that makes HTTP requests, you’ll probably want to mock those out for UI unit and integration tests. Let’s see how to use jest’s built-in mocking capabilities to do that. Component: import Reactfrom'react'import { loadGreeting }from'./api'function GreetingLoader...
Simulate 可以触发 所有 React 支持的事件类型 。renderIntoDocument() ：把一个 React 组件 render 到一个 detached 的 DOM 中。注意：该方法依赖 DOM 环境。不过不用担心，Jest 默认集成了 jsdom 。该方法会返回被 render 的 React 组件的实例。scryRenderedDOMComponentsWithClass() 与 findRenderedDOMComponentWi...