public IEnumerator set_icon_in_hotbar_slot_1()
{
Hotbar hotbar = Object.FindObjectOfType <Hotbar>();
Slot slot1 = hotbar.GetComponentInChildren <Slot>();
Assert.AreNotSame(_item.Icon, slot1.IconImage.sprite);
// Set position immediate to reduce the test time.
_item.transform.position = _player.transform.position;
// Wait till physics is processed (so collision with item would be triggered).
yield return(new WaitForFixedUpdate());
Assert.AreEqual(_item.Icon, slot1.IconImage.sprite);
}