System.Globalization.KoreanCalendar.AddYears C# (CSharp) Method

        public override DateTime AddYears(DateTime time, int years) {
            return (helper.AddYears(time, years));
        }

 public void PosTest4()
 {
     int yearAdd = TestLibrary.Generator.GetInt16(-55) % 2000 * (-1);
     DateTime dateTime = new DateTime(2000, 1, 1);
     DateTime expectedValue = new GregorianCalendar().ToDateTime(dateTime.Year + yearAdd, dateTime.Month, dateTime.Day, 0, 0, 0, 0);
     DateTime actualValue;
     System.Globalization.Calendar kC = new KoreanCalendar();
     actualValue = kC.AddYears(dateTime, yearAdd);
     Assert.Equal(kC.GetYear(expectedValue), kC.GetYear(actualValue));
 }