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30 lines
1.0 KiB
TypeScript
30 lines
1.0 KiB
TypeScript
import type * as React from 'react';
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import { renderHook } from '@testing-library/react-hooks';
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import useNowEffect from './useNowEffect';
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describe('useNowEffect', () => {
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test('should call the cleanup callback when the effect function is called and after unmount', async () => {
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const cleanupFunction = jest.fn(() => {});
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const effectFunction = jest.fn(() => cleanupFunction);
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const useTestHook = (dependencies: React.DependencyList) => {
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return useNowEffect(effectFunction, dependencies);
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};
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const hook = renderHook(useTestHook, { initialProps: [0] });
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expect(cleanupFunction).not.toHaveBeenCalled();
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expect(effectFunction).toHaveBeenCalledTimes(1);
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hook.rerender([0]);
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expect(cleanupFunction).not.toHaveBeenCalled();
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expect(effectFunction).toHaveBeenCalledTimes(1);
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hook.rerender([1]);
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expect(cleanupFunction).toHaveBeenCalledTimes(1);
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expect(effectFunction).toHaveBeenCalledTimes(2);
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hook.unmount();
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expect(cleanupFunction).toHaveBeenCalledTimes(2);
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expect(effectFunction).toHaveBeenCalledTimes(2);
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});
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});
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