public void GetFormat_DifferentInputParameterObjString(string format, object arg)
        {
            HexFormatProvider testHex = new HexFormatProvider();

            string actString = testHex.Format(format, arg, CultureInfo.CurrentCulture);

            StringAssert.AreEqualIgnoringCase(string.Format(CultureInfo.CurrentCulture, "{0:" + format + "}", arg), actString);
        }
        public string GetFormat_DifferentInputParameterObjDoubleAndNull(string format, object arg)
        {
            HexFormatProvider testHex = new HexFormatProvider();

            string actString = testHex.Format(format, arg, CultureInfo.CurrentCulture);

            return actString;
        }