public static ValidationTestValue CheckValidation(this Base32Encoding encoder, string encoded)
        {
            Exception toBytesError = null;

            try
            {
                encoder.ToBytes(encoded);
            }
            catch (Exception ex)
            {
                toBytesError = ex;
            }

            var validationResult = encoder.Validate(encoded);
            var vr2 = encoder.Validate(encoded, 0, encoded?.Length ?? 0);
            var vr3 = encoder.Validate(encoded != null ? "test" + encoded : null, 4, encoded?.Length ?? 0);

            if (validationResult != vr2 || validationResult != vr3)
            {
                throw new Exception("CheckValidation error");
            }

            return(new ValidationTestValue(validationResult, toBytesError));
        }