当我测试用户事件时，我使用react-testing-library的fireevent函数。
・src/example.js
import counter from "./components/counter";const example = () => { const origincount = 0; return ;};export default example;
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・src/commponets/counter.jsx
import { usestate } from "react";const counter = (props) => { const { origincount } = props; const [count, setcount] = usestate(origincount); const countup = () => { setcount(count + 1); }; return ( a test of counter
current count:{count} );};export default counter;
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・src/commponets/counter.test.jsx
import { render, screen, fireEvent } from "@testing-library/react";import Counter from "./Counter";test("Whether the current count counts up or not, in case the countUp button is clicked ", () => { const { debug } = render();//test the initial state. const spanElBeforUpdate = screen.getByText("Current count:0"); expect(spanElBeforUpdate).toBeInTheDocument();//test the user event. In this case, a click event. const btn = screen.getByRole("button", { name: "Countup" }); fireEvent.click(btn);//test the state which is after clicked button. const spanEl = screen.getByText("Current count:1"); expect(spanEl).toBeInTheDocument();});
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