React 基础知识~单元测试/自定义钩子

• 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 (
    <p classname="app">
      <counter></counter>
</p>
  );
}

export default app;

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・src/component/counter/counter.tsx

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

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

  return (
    <p>
      <h1>{count}</h1>
      <button onclick="{()"> increment()}&gt;increment</button>
    </p>
  );
};

export default counter;

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・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 };
};

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・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);
  });
});

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• 当我传递一个props时，在本例中它是initialcount（= 10），我添加了一个属性initialprops：{initialcount：10}。

• 当我测试自定义钩子的函数（在本例中为increment()）时，我使用该行为并在回调中调用increment()。

・成功

・失败

・显示动作

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