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40 lines
1.1 KiB
40 lines
1.1 KiB
import React, { memo, useContext } from 'react';
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import { fireEvent, pureRender } from '../../../tests/utils';
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import LocaleProvider from '../../locale';
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import LocaleContext from '../../locale/context';
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let innerCount = 0;
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let outerCount = 0;
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const handleClick = () => {
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outerCount++;
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};
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// we use'memo' here in order to only render inner component while context changed.
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const CacheInner: React.FC = memo(() => {
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innerCount++;
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// subscribe locale context
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useContext(LocaleContext);
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return null;
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});
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const CacheOuter: React.FC = memo(() => (
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<>
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<button type="button" onClick={handleClick} id="parent_btn">
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Click
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</button>
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<LocaleProvider locale={{ locale: 'locale' }}>
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<CacheInner />
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</LocaleProvider>
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</>
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));
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it("Rendering on LocaleProvider won't trigger rendering on child component.", () => {
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const { container, unmount } = pureRender(<CacheOuter />);
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expect(outerCount).toBe(0);
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expect(innerCount).toBe(1);
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fireEvent.click(container.querySelector('#parent_btn')!);
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expect(outerCount).toBe(1);
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expect(innerCount).toBe(1);
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unmount();
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});
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