public void poptestmethod1()
        {
            string strexpected;
            string stractualresult = "Error in push-stack is empty";
            int    top_index       = -1;

            C565Appln_Testcases.Class1 obj = new C565Appln_Testcases.Class1();
            strexpected = obj.pop(top_index);
            Assert.AreEqual(strexpected, stractualresult);
        }
        public void poptestmethod2()
        {
            string strexpected;
            string stractualresult;
            int    top_index = 2;

            C565Appln_Testcases.Class1 obj = new C565Appln_Testcases.Class1();
            strexpected     = obj.pop(top_index);
            stractualresult = Convert.ToString(--top_index);
            Assert.AreEqual(strexpected, stractualresult);
        }