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import { isSticky } from '~/lib/utils/sticky';
describe('sticky', () => {
let el;
beforeEach(() => {
document.body.innerHTML += `
<div class="parent">
<div id="js-sticky"></div>
</div>
`;
el = document.getElementById('js-sticky');
});
afterEach(() => {
el.parentNode.remove();
});
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', () => {
spyOn(el.classList, 'remove').and.callThrough();
isSticky(el, 0, el.offsetTop);
isSticky(el, 0, 0);
expect(
el.classList.remove,
).toHaveBeenCalledWith('is-stuck');
expect(
el.classList.contains('is-stuck'),
).toBeFalsy();
});
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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