public void ExpiryEndOfMonthTests()
{
var endOfMonthList = new List <DateTime>();
var current = new DateTime(2019, 1, 1);
var end = new DateTime(2020, 1, 1);
while (current < end)
{
var endOfMonth = Expiry.EndOfMonth(current);
endOfMonthList.Add(endOfMonth);
Assert.AreEqual(1, endOfMonth.Day);
Assert.Greater(endOfMonth, current);
current = current.AddDays(1);
}
var actual = endOfMonthList.Distinct().Count();
Assert.AreEqual(12, actual);
}