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https://github.com/streamich/react-use.git
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30abe2b22e
feat(useFirstMountState): hook to track if render is first; feat(useRendersCount): hook to track renders count; refactor(useUpdateEffect): now uses useFirstMountState hook; refactor(usePreviousDistinct): now uses with useFirstMountState hook; docs: update readme;
23 lines
691 B
TypeScript
23 lines
691 B
TypeScript
import { renderHook } from '@testing-library/react-hooks';
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import { useFirstMountState } from '../src';
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describe('useFirstMountState', () => {
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it('should be defined', () => {
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expect(useFirstMountState).toBeDefined();
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});
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it('should return boolean', () => {
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expect(renderHook(() => useFirstMountState()).result.current).toEqual(expect.any(Boolean));
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});
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it('should return true on first render and false on all others', () => {
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const hook = renderHook(() => useFirstMountState());
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expect(hook.result.current).toBe(true);
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hook.rerender();
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expect(hook.result.current).toBe(false);
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hook.rerender();
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expect(hook.result.current).toBe(false);
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});
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});
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