public void TestMethod7()
{
DNode head = null;
head = DoublyLinkedListOps.Insert(head, 1, 0);
// 1 <-> null
Assert.AreEqual(1, head.data);
Assert.IsNull(head.next);
}
public void TestMethod11()
{
DNode head = null;
head = DoublyLinkedListOps.Insert(head, 1, 0);
head = DoublyLinkedListOps.Insert(head, 2, 0);
head = DoublyLinkedListOps.Insert(head, 3, 100);
// 2 <-> 1 <-> 3 <-> null
Assert.AreEqual(2, head.data);
Assert.AreEqual(1, head.next.data);
Assert.AreEqual(2, head.next.prev.data);
Assert.AreEqual(3, head.next.next.data);
Assert.AreEqual(1, head.next.next.prev.data);
Assert.IsNull(head.next.next.next);
}