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