akka.net test that fails before Tell has had time to run

gistfile1.txt

	public class WhenContentWasAlreadyPublished : TestKit, ILoadUmbracoNodes, IPublishUmbracoContent
	{
		private IContent _content;
		private IContent _publishedContent;
		private bool _publishContentCalled;

		[Fact]
		public void ItPublishesWhenAsked()
		{
			var publisherProps = UmbracoAdmin.ContentPublishing.NodePublisher.Props(this, this);
			var publisher = Sys.ActorOf(publisherProps);

			publisher.Tell(Get(1));

			_publishContentCalled.Should().BeTrue();
			_publishedContent.Should().Be(_content);
		}

		public IContent Get(int id)
		{
			_content = A.Fake<IContent>();
			A.CallTo(() => _content.HasPublishedVersion).Returns(true);
			return _content;
		}

		public Attempt<PublishStatus> Publish(IContent content)
		{
			_publishedContent = content;
			_publishContentCalled = true;
			return Attempt<PublishStatus>.Succeed();
		}
	}