System.Globalization.TaiwanCalendar.ToFourDigitYear C# (CSharp) Method

        public override int ToFourDigitYear(int year) {
            if (year <= 0) {
                throw new ArgumentOutOfRangeException("year",
                    Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
            }

            if (year > helper.MaxYear) {
                throw new ArgumentOutOfRangeException(
                            "year",
                            String.Format(
                                CultureInfo.CurrentCulture,
                                Environment.GetResourceString("ArgumentOutOfRange_Range"),
                                1,
                                helper.MaxYear));
            }
            return (year);
        }
    }

 public void PosTest1()
 {
     System.Globalization.Calendar tc = new TaiwanCalendar();
     Random rand = new Random(-55);
     int year = rand.Next(1, 8088);
     Assert.Equal(year, tc.ToFourDigitYear(year));
 }