22 lines
1,023 B
JavaScript
22 lines
1,023 B
JavaScript
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import { isScrolledToBottom } from '~/lib/utils/scroll_utils';
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describe('isScrolledToBottom', () => {
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const setScrollGetters = (getters) => {
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Object.entries(getters).forEach(([name, value]) => {
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jest.spyOn(Element.prototype, name, 'get').mockReturnValue(value);
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});
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};
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it.each`
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context | scrollTop | scrollHeight | result
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${'returns false when not scrolled to bottom'} | ${0} | ${2000} | ${false}
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${'returns true when scrolled to bottom'} | ${1000} | ${2000} | ${true}
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${'returns true when scrolled to bottom with subpixel precision'} | ${999.25} | ${2000} | ${true}
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${'returns true when cannot scroll'} | ${0} | ${500} | ${true}
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`('$context', ({ scrollTop, scrollHeight, result }) => {
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setScrollGetters({ scrollTop, clientHeight: 1000, scrollHeight });
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expect(isScrolledToBottom()).toBe(result);
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});
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});
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