@Test
public void testAddAfter()
{

    DoublyLinkedList<Integer> list = new DoublyLinkedList<Integer>();
    list.add(1);
    ListNode2<Integer> node2 = list.add(2);
    ListNode2<Integer> node4 = list.add(4);
    list.addAfter(node2, 3);
    assertEquals(4, list.size());
    assertArrayEquals(new Integer[]{1, 2, 3, 4}, list.toArray());
    ListNode2<Integer> node5 = list.addAfter(node4, 5);
    assertEquals(5, list.size());
    assertArrayEquals(new Integer[]{1, 2, 3, 4, 5}, list.toArray());
    assertEquals(new Integer(5), list.last());
    assertEquals(node5, list.head());
}