1 - service bus extensions.cs

    public static class ServiceBusExtensions
    {
        public static bool HasSubscribersFor<T>(this IServiceBus serviceBus, T message)
        {
        	IEnumerable<Action<object>> enumerable = serviceBus.OutboundPipeline.Enumerate(message);
        	return enumerable.Count() > 0;
        }
    }

2 - how to mock service bus extensions with csharp rhino mocks.cs

private IServiceBus BuildServiceBus()
{
	var serviceBus = Mock<IServiceBus>();
	var messagePipeline = Mock<IMessagePipeline>();
	var messageHandlers = new Action<Object>[1];

	messagePipeline.Stub(m => m.Enumerate(null))
		.IgnoreArguments()
		.Return(messageHandlers);

	serviceBus.Stub(s => s.OutboundPipeline).Return(messagePipeline);

	return serviceBus;
}

3 - how to stub service bus extensions with ruby.rb

class ServiceBusExtensions
  def HasSubscribersFor(*args)
    return true
  end
end