React 基础知识~单元测试/用户事件

IT行业相对于一般传统行业，发展更新速度更快，一旦停止了学习，很快就会被行业所淘汰。所以我们需要踏踏实实的不断学习，精进自己的技术，尤其是初学者。今天golang学习网给大家整理了《React 基础知识~单元测试/用户事件》，聊聊，我们一起来看看吧！

• 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;

・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}
      
      

        countup
      
    
  );
};

export default counter;

・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();
});

・成功

・失败

好了，本文到此结束，带大家了解了《React 基础知识~单元测试/用户事件》，希望本文对你有所帮助！关注golang学习网公众号，给大家分享更多文章知识！