public void ToXml_CreatedAtBetween()
{
SubscriptionSearchRequest request = new SubscriptionSearchRequest().CreatedAt.Between("1/1/2015", "1/2/2015");
var xml = "<search><created-at><min>1/1/2015</min><max>1/2/2015</max></created-at></search>";
Assert.AreEqual(xml, request.ToXml());
}