private void VerifyMessageProcessing(Type handlerType, Type messageType)
{
_messageBusInitializer.MessageHandlerResolverMock.Received(1).Resolve(handlerType);
TestHandlerBase.ArgsReceived.Count.Should().Be(1);
var arg = TestHandlerBase.ArgsReceived.First();
AssertionExtensions.ShouldBeEquivalentTo(arg.GetType(), messageType);
}