public void GetDate()
{
//Saves the cache and pass it a timespan for expiration
barrel.Add(key: url, data: monkeys, expireIn: TimeSpan.FromDays(1));
var cached = barrel.Get <IEnumerable <Monkey> >(url);
var date = barrel.GetExpiration(url);
Assert.IsNotNull(date);
Assert.IsTrue(date <= DateTime.UtcNow.Add(TimeSpan.FromDays(1)));
}