Test.cs

  public class WarehouseProductTests
  {
      private readonly string _sku;
      private readonly int _initialQuantity;
      private readonly WarehouseProduct _sut;
      private readonly Fixture _fixture;

      public WarehouseProductTests()
      {
          _fixture = new Fixture();
          _fixture.Customizations.Add(new Int32SequenceGenerator());
          _sku = _fixture.Create<string>();
          _initialQuantity = (int)_fixture.Create<uint>();

          _sut = WarehouseProduct.Load(_sku, new [] {
              new ProductReceived(_sku, _initialQuantity, DateTime.UtcNow)
          });
      }

      [Fact]
      public void ShipProductShouldRaiseProductShipped()
      {
          var quantityToShip = _fixture.Create<int>();
          _sut.ShipProduct(quantityToShip);

          var outEvents = _sut.GetUncommittedEvents();
          outEvents.Count.ShouldBe(1);
          var outEvent = outEvents.Single();
          outEvent.ShouldBeOfType<ProductShipped>();

          var productShipped = (ProductShipped)outEvent;
          productShipped.ShouldSatisfyAllConditions(
              x => x.Quantity.ShouldBe(quantityToShip),
              x => x.Sku.ShouldBe(_sku),
              x => x.EventType.ShouldBe("ProductShipped")
          );
      }
}