public void AddNotificationsFromAssembly_Should_AddAsyncNotificationHandler_To_ServicesCollection(IUmbracoBuilder sut)
        {
            sut.AddNotificationsFromAssembly <CustomizationAttribute>();

            var expectedHandlerType = typeof(INotificationAsyncHandler <ContentPublishedNotification>);
            var handler             = sut.Services.SingleOrDefault(x => x.ServiceType == expectedHandlerType);

            Assert.NotNull(handler);
            Assert.That(handler.ImplementationType, Is.EqualTo(typeof(StubNotificationHandler)));
        }