@Test public void shouldRemoveDuplicatedElements2() {

  ListNode<Integer> head = createList(new Integer[] { 0, 1, 0, 2, 2, 3, 4, 4 });
  removeDuplicates.remove2(head);
  assertListContainsElements(new Integer[] { 0, 1, 2, 3, 4 }, head);
}