export default { props: { things: [ { id: 1, name: 'a' }, { id: 2, name: 'b' }, { id: 3, name: 'c' }, { id: 4, name: 'd' }, { id: 5, name: 'e' } ] }, html: `
a
b
c
d
e
`, test({ assert, component, target, window, raf }) { let divs = document.querySelectorAll('div'); divs.forEach(div => { div.getBoundingClientRect = function() { const index = [...this.parentNode.children].indexOf(this); const top = index * 30; return { left: 0, right: 100, top, bottom: top + 20 } }; }) component.things = [ { id: 5, name: 'e' }, { id: 2, name: 'b' }, { id: 3, name: 'c' }, { id: 4, name: 'd' }, { id: 1, name: 'a' } ]; divs = document.querySelectorAll('div'); assert.equal(divs[0].dy, 120); assert.equal(divs[4].dy, -120); raf.tick(50); assert.equal(divs[0].dy, 60); assert.equal(divs[4].dy, -60); raf.tick(100); assert.equal(divs[0].dy, 0); assert.equal(divs[4].dy, 0); } };