public void RpnEngine_TryParseRpnToken_Failure()
        {
            var rpnEngine = new RpnEngine();

            var input = "* * *";

            var rpnTokens = input.Split(' ');

            foreach (var rpnToken in rpnTokens)
            {
                var isDecimal = rpnEngine.TryParseDecimal(rpnToken);

                isDecimal.Should().BeFalse("It's set to false");
            }
        }
        public void RpnEngine_TryParseRpnToken_Success()
        {
            var rpnEngine = new RpnEngine();

            var input = "3 5";

            var rpnTokens = input.Split(' ');

            foreach (var rpnToken in rpnTokens)
            {
                var isDecimal = rpnEngine.TryParseDecimal(rpnToken);

                isDecimal.Should().BeTrue("It's set to true");
            }
        }