# React测试 安装 react-testing-library、react-dom、react-scripts 安装 jest、jest-dom 测试用例 ``` import React from "react"; import { render, cleanup, fireEvent } from "react-testing-library"; import { App } from "./index"; afterEach(cleanup); describe("基础React单元测试", function () { it("index组件测试", function () { const { getByTestId } = render(<App />); const [ul, nav] = [getByTestId("js-ul"), getByTestId("js-h2")]; expect(ul.children.length).toBe(2); expect(nav.textContent).toContain("京程一灯"); }) }); ```