public void WhenICallTheValidateMethod()
        {
            var validator = new FullEnrollmentNumberValidator(_checkDigitCalculator, _hexadecimalConverter);

            _result = validator.Validate(It.IsAny <string>());
        }
        public void WhenIInputIntoTheFullEnrollmentNumberValidator(string fullEnrollmentNumber)
        {
            var validator = new FullEnrollmentNumberValidator(_checkDigitCalculator, _hexadecimalConverter);

            _result = validator.Validate(fullEnrollmentNumber);
        }