public static void GetEnumerator_FromEmptyStack()
{
int[] operands = new int[] { };
Stack<int> operandStack = new Stack<int>((IEnumerable<int>)operands);
int[] expectedValues = new int[] { };
Stack<int>.Enumerator enumerator = operandStack.GetEnumerator();
Assert.True(HelperClass.VerifyEnumerator(enumerator, expectedValues)); //"Faild to get enumerator of an empty stack"
}