78 lines
1.7 KiB
JavaScript
78 lines
1.7 KiB
JavaScript
import { setHTMLFixture } from 'helpers/fixtures';
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import { isSticky } from '~/lib/utils/sticky';
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const TEST_OFFSET_TOP = 500;
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describe('sticky', () => {
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let el;
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let offsetTop;
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beforeEach(() => {
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setHTMLFixture(
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`
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<div class="parent">
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<div id="js-sticky"></div>
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</div>
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`,
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);
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offsetTop = TEST_OFFSET_TOP;
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el = document.getElementById('js-sticky');
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Object.defineProperty(el, 'offsetTop', {
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get() {
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return offsetTop;
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},
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});
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});
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afterEach(() => {
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el = null;
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});
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describe('when stuck', () => {
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it('does not remove is-stuck class', () => {
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isSticky(el, 0, el.offsetTop);
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isSticky(el, 0, el.offsetTop);
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expect(el.classList.contains('is-stuck')).toBeTruthy();
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});
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it('adds is-stuck class', () => {
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isSticky(el, 0, el.offsetTop);
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expect(el.classList.contains('is-stuck')).toBeTruthy();
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});
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it('inserts placeholder element', () => {
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isSticky(el, 0, el.offsetTop, true);
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expect(document.querySelector('.sticky-placeholder')).not.toBeNull();
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});
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});
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describe('when not stuck', () => {
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it('removes is-stuck class', () => {
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jest.spyOn(el.classList, 'remove');
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isSticky(el, 0, el.offsetTop);
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isSticky(el, 0, 0);
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expect(el.classList.remove).toHaveBeenCalledWith('is-stuck');
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expect(el.classList.contains('is-stuck')).toBe(false);
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});
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it('does not add is-stuck class', () => {
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isSticky(el, 0, 0);
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expect(el.classList.contains('is-stuck')).toBeFalsy();
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});
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it('removes placeholder', () => {
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isSticky(el, 0, el.offsetTop, true);
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isSticky(el, 0, 0, true);
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expect(document.querySelector('.sticky-placeholder')).toBeNull();
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});
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});
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});
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