public static void TestStack2Methods()
{
var stack = new Stack2 <int>();
Assert.AreEqual(0, stack.Size(), "TestSize must be 0, but not");
stack.Push(1);
Assert.AreEqual(1, stack.Size(), "TestSize must be 1, but not");
stack.Push(2);
Assert.AreEqual(2, stack.Size(), "TestSize must be 2, but not");
stack.Push(3);
Assert.AreEqual(3, stack.Size(), "TestSize must be 3, but not");
var top = stack.Peek();
Assert.AreEqual(3, top, "TestStackMethods Peek value must be 3");
var value = stack.Pop();
Assert.AreEqual(3, value, "TestStackMethods Pop value must be 3");
Assert.AreEqual(2, stack.Size(), "TestSize must be 2, but not");
value = stack.Pop();
Assert.AreEqual(2, value, "TestStackMethods Pop value must be 2");
Assert.AreEqual(1, stack.Size(), "TestSize must be 1, but not");
value = stack.Pop();
Assert.AreEqual(1, value, "TestStackMethods Pop value must be 1");
Assert.AreEqual(0, stack.Size(), "TestSize must be 0, but not");
value = stack.Pop();
Assert.AreEqual(0, stack.Peek(), "TestStackMethods stack is not empty");
Assert.AreEqual(0, value, "TestStackMethods stack is not empty");
Assert.AreEqual(0, stack.Peek(), "TestStackMethods stack is not empty");
}