public void CheckValidateForValidInput()
        {
            DatesOrderValidation validation = new DatesOrderValidation(_validInput);

            try
            {
                validation.Validate();
            }
            catch
            {
                Assert.Fail();
            }
        }
        public void CheckValidateForInvalidInput()
        {
            DatesOrderValidation validation = new DatesOrderValidation(_invalidInput);

            Assert.ThrowsException <ValidationException>(() => validation.Validate());
        }