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React 基础知识~单元测试/自定义钩子

来源：dev.to 2024-11-05 13:34:11 0浏览收藏

文章小白一枚，正在不断学习积累知识，现将学习到的知识记录一下，也是将我的所得分享给大家！而今天这篇文章《React 基础知识~单元测试/自定义钩子》带大家来了解一下##content_title##，希望对大家的知识积累有所帮助，从而弥补自己的不足，助力实战开发！

当我测试自定义钩子组件时，我使用从@testing-library/react'导入的renderhook和从react-dom/test-utils'导入的act。

・src/app.tsx

import "./app.css";
import counter from "./component/counter/counter";

function app() {
  return (
    <div classname="app">
      <counter />
    </div>
  );
}

export default app;

・src/component/counter/counter.tsx

import react, { usestate } from "react";
import { usecounter } from "../../hooks/usecounter";

const counter = () => {
const { count, increment } = usecounter({ initialcount: 10 });

  return (
    <div>
      <h1>{count}</h1>
      <button onclick={() => increment()}>increment</button>
    </div>
  );
};

export default counter;

・src/hooks/usecounter.tsx

import react, { usestate } from "react";
import { usecounterprops } from "./usecounter.type";

type usecounterprops = {
  initialcount?: number;
};


export const usecounter = ({ initialcount = 0 }: usecounterprops = {}) => {
  const [count, setcount] = usestate(initialcount);
  const increment = () => setcount((prev) => prev + 1);

  return { count, increment };
};

・src/hooks/usecounter.test.tsx

import { renderHook } from "@testing-library/react";
import { useCounter } from "./useCounter";
import { act } from "react-dom/test-utils";

describe("useCounter", () => {
  test("Should render the initial count", () => {
    const { result } = renderHook(useCounter, {
      initialProps: { initialCount: 10 },
    });
    expect(result.current.count).toBe(10);
  });

  test("Increment the  count", () => {
    const { result } = renderHook(useCounter);
    act(() => {
      result.current.increment();
    });
    expect(result.current.count).toBe(1);
  });
});