57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
import * as Horizon from '@cloudsop/horizon/index.ts';
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import { getLogUtils } from '../../jest/testUtils';
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import { Text } from '../../jest/commonComponents';
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describe('useRef Hook Test', () => {
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const { useState, useRef } = Horizon;
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const LogUtils = getLogUtils();
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it('测试useRef', () => {
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const App = () => {
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const [num, setNum] = useState(1);
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const ref = useRef();
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if (!ref.current) {
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ref.current = num;
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}
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return (
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<>
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<p>{num}</p>
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<p id="sp">{ref.current}</p>
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<button onClick={() => setNum(num + 1)} />
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</>
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);
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};
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Horizon.render(<App />, container);
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expect(container.querySelector('p').innerHTML).toBe('1');
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expect(container.querySelector('#sp').innerHTML).toBe('1');
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// 点击按钮触发num加1,ref不变
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container.querySelector('button').click();
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expect(container.querySelector('p').innerHTML).toBe('2');
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expect(container.querySelector('#sp').innerHTML).toBe('1');
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});
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it('更新current值时不会re-render', () => {
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const App = () => {
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const ref = useRef(1);
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return (
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<>
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<button onClick={() => {
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ref.current += 1;
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}}>
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button
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</button>
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<Text text={ref.current} />;
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</>
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);
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};
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Horizon.render(<App />, container);
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expect(LogUtils.getAndClear()).toEqual([1]);
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expect(container.querySelector('p').innerHTML).toBe('1');
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// 点击按钮触发ref.current加1
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container.querySelector('button').click();
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// ref.current改变不会触发重新渲染
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expect(LogUtils.getAndClear()).toEqual([]);
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expect(container.querySelector('p').innerHTML).toBe('1');
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});
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});
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