public void ToXml_DaysPastDueGreaterThanOrEqualTo()
{
SubscriptionSearchRequest request = new SubscriptionSearchRequest().DaysPastDue.GreaterThanOrEqualTo(3);
var xml = "<search><days-past-due><min>3</min></days-past-due></search>";
Assert.AreEqual(xml, request.ToXml());
}