public void Test_Clone()
{
MyDeque <int> deq1 = new MyDeque <int>();
MyDeque <int> deq2 = new MyDeque <int>();
deq1.EnqueueLast(1);
deq1.EnqueueLast(2);
deq1.EnqueueLast(3);
deq1.EnqueueLast(4);
deq2 = (MyDeque <int>)deq1.Clone();
Assert.AreEqual(deq1.Count, deq2.Count);
Assert.AreEqual(deq1.PeekLast(), deq2.PeekLast());
}