public void Creates_test_handler_and_adds_it_to_publisher()
{
var publisher = new TestPublisher();
var handler = publisher.RegisterTestHandler<TestMessage>();
Assert.That(handler, Is.InstanceOf<TestHandler<TestMessage>>());
Assert.That(((IHandlerSource)publisher.GetAssignee()).ResolveHandlersFor(typeof(TestMessage)).First(), Is.SameAs(handler));
}