How to mock client, not server?

[raxod502]

I have a websocket server which needs to be tested. I pass it a WebSocket object from node-ws, and it communicates with the client using that object. Normally the object is obtained from express-ws routing, but for testing it should be WebSocket from mock-socket. However, I cannot figure out how I am supposed to get any information out of the WebSocket object from mock-socket after passing it to my server. Does this library only support mocking servers and not clients? It is hard to tell because the README does not really document what is supposed to be supported, nor is there any API reference.