89 lines
2.0 KiB
JavaScript
89 lines
2.0 KiB
JavaScript
/**
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* External dependencies
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*/
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import { render, screen, act } from '@testing-library/react';
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/**
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* Internal dependencies
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*/
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import { usePositionRelativeToViewport } from '../use-position-relative-to-viewport';
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describe( 'usePositionRelativeToViewport', () => {
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function setup() {
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const TestComponent = () => {
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const [
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referenceElement,
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positionRelativeToViewport,
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] = usePositionRelativeToViewport();
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return (
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<>
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{ referenceElement }
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{ positionRelativeToViewport === 'below' && (
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<p data-testid="below"></p>
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) }
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{ positionRelativeToViewport === 'visible' && (
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<p data-testid="visible"></p>
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) }
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{ positionRelativeToViewport === 'above' && (
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<p data-testid="above"></p>
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) }
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</>
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);
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};
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return render( <TestComponent /> );
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}
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it( "calls IntersectionObserver's `observe` and `unobserve` events", async () => {
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const observe = jest.fn();
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const unobserve = jest.fn();
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// @ts-ignore
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IntersectionObserver = jest.fn( () => ( {
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observe,
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unobserve,
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} ) );
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const { unmount } = setup();
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expect( observe ).toHaveBeenCalled();
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unmount();
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expect( unobserve ).toHaveBeenCalled();
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} );
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it.each`
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position | isIntersecting | top
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${'visible'} | ${true} | ${0}
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${'below'} | ${false} | ${10}
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${'above'} | ${false} | ${0}
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${'above'} | ${false} | ${-10}
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`(
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"position relative to viewport is '$position' with isIntersecting=$isIntersecting and top=$top",
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( { position, isIntersecting, top } ) => {
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let intersectionObserverCallback = ( entries ) => entries;
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// @ts-ignore
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IntersectionObserver = jest.fn( ( callback ) => {
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// @ts-ignore
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intersectionObserverCallback = callback;
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return {
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observe: () => void null,
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unobserve: () => void null,
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};
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} );
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setup();
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act( () => {
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intersectionObserverCallback( [
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{ isIntersecting, boundingClientRect: { top } },
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] );
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} );
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expect( screen.getAllByTestId( position ) ).toHaveLength( 1 );
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}
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);
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} );
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