@Test public void shouldSumNumbersWithMoreThanOneDigit() {

  ListNode<Integer> n1 = createList(new int[] { 1, 5, 5 });
  ListNode<Integer> n2 = createList(new int[] { 3, 1, 4 });
  int result = sumLists.sum(n1, n2);
  assertEquals(469, result);
}