public void DblLinkedList9()
{
Node node = new Node(1);
node.xVal = 1;
node.yVal = 2;
DblLinkedList dll = new DblLinkedList(node);
Node node2 = new Node(2);
node2.xVal = 3;
node2.yVal = 4;
DblLinkedList dll2 = new DblLinkedList(node2);
dll.setNext(dll2);
dll2.setPrev(dll);
Assert.Equal(1, dll.getNode().xVal);
Assert.Equal(3, dll2.getNode().xVal);
Assert.Equal(1, dll2.getPrev().getNode().xVal);
Assert.Equal(3, dll.getNext().getNode().xVal);
}