public void AddShelfToStoreShouldAddShelf()
{
Shelf receivedShelf = null;
var expected = new Shelf();
var store = new Store();
_storageSystem.Stores.Add(store);
var addShelfEvent = _eventAggregator.GetEvent <PubSubEvent <AddShelfEvent> >();
addShelfEvent.Subscribe(e => receivedShelf = e.Shelf);
_storageSystem.AddShelfToStore(store, expected);
Task.Delay(25).Wait();
store.Shelves.Count.Should().Be(1);
var shelf = store.Shelves.First();
shelf.Should().Be(expected);
receivedShelf.Should().Be(expected);
}