public void GetFiscalYearByDateTimeRange()
        {
            var testFys = new List <string>
            {
                "20162017",
                "20172018",
                "20182019"
            };
            var           firstDate  = new DateTime(2017, 1, 28);
            var           secondDate = new DateTime(2018, 12, 28);
            List <string> fys        = FiscalYear.GetFiscalYearByDateTimeRange(firstDate, secondDate);

            CollectionAssert.AreEqual(testFys, fys);
        }