Get Status of Socket IO Server

I need to create a Socket IO server and wait until it is up and running (for running some tests). I've looked through the documentation but can't find any event or callback for creating a server that notifies you when it's up and running (or if it's experiencing any errors). Is there a way to monitor the status of a Socket IO server?

P.S. - To be clear, I'm not interested in monitoring the http.Server that Socket IO runs on top of, I want to know about Socket IO specifically (unless I'm misunderstanding, and those two things are 100% equivalent).