public void CheckAddNewProblemMethod()
        {
            MathProblemStack mathProblems = new MathProblemStack();

            mathProblems.addNewMathProblem("2 + 2");


            string expectedResult = "2 + 2";
            string actualResult   = mathProblems.Stack.Peek().ToString();

            Assert.AreEqual(expectedResult, actualResult);
        }
        public void CheckReturnLastProblemMethod()
        {
            MathProblemStack mathProblems = new MathProblemStack();

            mathProblems.addNewMathProblem("2 + 2");
            mathProblems.addNewMathProblem("7 + 9");

            string expectedResult = "7 + 9";
            string actualResult   = mathProblems.getLastMathProblem();

            Assert.AreEqual(expectedResult, actualResult);
        }
        public void CheckCreatingStack()
        {
            MathProblemStack mathProblems = new MathProblemStack();

            Assert.IsNotNull(mathProblems);
        }