public void correct_string_value_for_decimal_value_is_returned()
        {
            var specifiers = new ReadOnlyDictionary <string, string>(new Dictionary <string, string>
            {
                { Specifier, "1.5" }
            });
            var operand = new SimpleOperand(specifiers, Specifier);

            Assert.AreEqual("1.5", operand.GetStringValue().Result, "Decimal value returned by the operand is not correct");
        }
        public void wrong_specifier_on_get_string_value_failles()
        {
            var specifiers = new ReadOnlyDictionary <string, string>(new Dictionary <string, string>
            {
                { Specifier, "1.5" }
            });
            var operand = new SimpleOperand(specifiers, "missing");

            try
            {
                var x = operand.GetStringValue().Result;
                Assert.IsNotNull(x);
            }
            catch (AggregateException ex)
            {
                throw ex.InnerExceptions.First();
            }
        }