public void TestClearMethod()
{
var linkedList = new DoubleLinkedList<int>();
linkedList.AddFirst(3);
linkedList.AddLast(2);
linkedList.AddAfter(linkedList.First, 1);
linkedList.AddBefore(linkedList.Last, 3);
linkedList.Clear();
Assert.AreEqual(0, linkedList.Count);
Assert.IsNull(linkedList.First);
Assert.IsNull(linkedList.Last);
}
public void TestAddAfterMethod()
{
var linkedList = new DoubleLinkedList<int>();
linkedList.AddFirst(4);
linkedList.AddFirst(1);
linkedList.AddAfter(linkedList.First, 2);
linkedList.AddAfter(linkedList.Last, 5);
linkedList.AddAfter(linkedList.Find(2), 3);
CollectionAssert.AreEqual(new List<int> { 1, 2, 3, 4, 5 }, linkedList.ToList());
}