public void TestAddToHead()
{
var dlLits = new DoublyLinkingList <int>(1);
dlLits.AddToHead(0);
Assert.AreEqual(0, dlLits[0]);
Assert.AreEqual(1, dlLits[1]);
}
public void TestAddToNullList()
{
var dlList = new DoublyLinkingList <int>();
dlList.AddToHead(4);
dlList.AddToEnd(5);
Assert.AreEqual(4, dlList.Current);
Assert.AreEqual(4, dlList[0]);
Assert.AreEqual(5, dlList[dlList.Length - 1]);
}