@Test
public void testThatUpdateItemAddsItemToTheOverlay() {

    ItemizedIconOverlay<UserPositionItem> overlay = spy(userPositionManager.overlay);
    userPositionManager.overlay = overlay;
    List<UserPositionItem> items = new ArrayList<UserPositionItem>();
    items.add(item);
    userPositionManager.updateItems(items);
    verify(overlay, times(1)).removeAllItems();
    verify(overlay, times(1)).addItems(any(List.class)); // TODO: really check the contents!
}