How to trigger scroll event in acceptance test

I need to trigger window scroll event to test infinite scrolling, I've tried to use triggerEvent, but it seems that I missing something and it doesn't work. I'm using Ember 2.0 and list is rendered inside the component if it matters. Test fails on last 2 assertions, scroll position doesn't change after triggering event

test 'loads more items when scrolling', (assert) ->
  visit '/locations/1'   
  andThen ->
    assert.equal(find('.items-list li').length, 30)

    find(window).scrollTop(10000)
    triggerEvent(window, 'scroll')

    andThen ->
      assert.ok(find(window).scrollTop() > 0, 'window should scroll')
      assert.ok(find('.items-list li').length > 30, 'should load more items after reaching threshold')

Has anyone successfully triggered scroll event in their tests?