public void Validate_NotFutureDateTime_Correctly(int daysToAdd, bool expected)
        {
            //Arrange
            DateTime dt = DateTime.Now.AddDays(daysToAdd);
            IValueValidator <DateTime> validator = new NotFutureValidator();

            //Act
            bool valid = validator.IsValid(dt);

            //Assert
            Assert.Equal(expected, valid);
        }