Testing websocket application

[enkeyz]

I went through the whole book - it was really awesome, but when I started my first bigger project I just can't apply it.

I planned an application, where whenever an user visits a website, the site connect to the websocket server, and the golang websocket server broadcasts the number of active connections to every active websocket client, every x second. I've a hub type that stores all the connections.

I started testing by small steps - testing the ws connection, making the websocket return the number of active connection whenever a client joins, but stuck with testing the broadcast functionality.

How would you TDD such application?

Repo: https://github.com/enkeyz/websock-usercount