public void Append()
{
_cache.Store("key", 123, Encoding.ASCII.GetBytes("12345"), new DateTime(1999, 1, 1));
_cache.Append("key", 123, new DateTime(1999, 1, 1), Encoding.ASCII.GetBytes("12345"), false);
Assert.AreEqual(2, _testObserver.Messages.Count);
var storeNotification1 = GetNotification();
Assert.IsInstanceOfType(storeNotification1, typeof(StoreNotification));
var storeNotification2 = GetNotification();
Assert.IsInstanceOfType(storeNotification2, typeof(StoreNotification));
}