public void TestParameterNotNullPasses(string parameterName, DateTime?parameterValue, NullableDateTimeValidator validatorBase)
        {
            "Given a new ValidatorBase"
            .x(() => validatorBase = Validate.That(parameterName, parameterValue));

            "Testing that the parameter is not null"
            .x(() => validatorBase.IsNotNull().OtherwiseThrowException());

            "Should not result in an exception"
            .x(() => validatorBase.CurrentException.Should().BeNull());
        }
        public void TestParameterNotNullFails(string parameterName, DateTime?parameterValue, NullableDateTimeValidator validatorBase, Action act)
        {
            "Given a new ValidatorBase"
            .x(() => validatorBase = Validate.That(parameterName, parameterValue));

            "Testing that the parameter is not null"
            .x(() => act = () => validatorBase.IsNotNull().OtherwiseThrowException());

            "Should throw an exception"
            .x(() => act.ShouldThrow <ArgumentNullException>()
               .WithMessage(string.Format(Resources.MustNotBeNull + "\r\nParameter name: {0}", parameterName)));
        }