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