public void AddPartToShelfShouldAddPart()
{
Part receivedPart = null;
var expected = new Part();
var store = new Store();
var shelf = new Shelf();
store.Shelves.Add(shelf);
_storageSystem.Stores.Add(store);
var addPartEvent = _eventAggregator.GetEvent <PubSubEvent <AddPartEvent> >();
addPartEvent.Subscribe(e => receivedPart = e.Part);
_storageSystem.AddPartToShelf(store.Shelves.First(), expected);
Task.Delay(25).Wait();
shelf.Parts.Count.Should().Be(1);
shelf.Parts.First().Should().Be(expected);
receivedPart.Should().Be(expected);
}