public void ExpiryEndOfYearTests()
{
var endOfYearList = new List <DateTime>();
var current = new DateTime(2019, 1, 1);
var end = new DateTime(2020, 1, 1);
while (current < end)
{
var endOfYear = Expiry.EndOfYear(current);
endOfYearList.Add(endOfYear);
Assert.AreEqual(1, endOfYear.Day);
Assert.AreEqual(end.Year, endOfYear.Year);
Assert.Greater(endOfYear, current);
current = current.AddDays(1);
}
var actual = endOfYearList.Distinct().Count();
Assert.AreEqual(1, actual);
}