public void Test_Peek_Element()
        {
            Stacc <int> s = new Stacc <int>(3);

            s.Push(2);
            s.Push(1);
            int value = s.Peek();

            Assert.AreEqual(1, value);
            Assert.AreEqual(2, s.Size);
        }
        public void Test_Peek_Eeception()
        {
            Stacc <int> s = new Stacc <int>(3);

            Assert.Throws <ExpanditureProhibitionException>(() => s.Peek());
        }