public void ConvertToPersianDatePersianDigitTest() { Assert.AreEqual("۱۳۹۰/۶/۲۲", dateTimeHelper.ConvertToPersianDatePersianDigit(Convert.ToDateTime("2011/09/13")), "1"); Assert.AreEqual(string.Empty, dateTimeHelper.ConvertToPersianDatePersianDigit(null), "2"); Assert.AreEqual("۱۳۹۰/۱/۱", dateTimeHelper.ConvertToPersianDatePersianDigit(Convert.ToDateTime("2011/03/21")), "3"); Assert.AreEqual("۱۳۸۹/۱۲/۲۹", dateTimeHelper.ConvertToPersianDatePersianDigit(Convert.ToDateTime("2011/03/20")), "4"); Assert.AreEqual("۱۳۸۷/۱۲/۳۰", dateTimeHelper.ConvertToPersianDatePersianDigit(Convert.ToDateTime("2009/03/20")), "5"); Assert.AreEqual("۱۳۸۸/۱/۱", dateTimeHelper.ConvertToPersianDatePersianDigit(Convert.ToDateTime("2009/03/21")), "6"); }