node.js - How to test socket.io events being called with sinon.spy -

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first of all, i'm trying test second time function being called returns correct value. more specific, i'm trying test second time event received socket.on() returns correct value.

i know sinon.spy() can detect whether function being called or not. seems not working socket.io events.

i'm trying test example, 

var socketio = io.connect(someurl); socketio.on(eventname, cb);

if event 'connect' called. tried

var spy = sinon.spy(socketio, 'on'); assert(spy.witharg(eventname).called);

but says it's never being called.

furthermore, if i'd test data in callback function right or not, example

var socketio = io.connect(someurl); socketio.on(eventname, function(data) {     data.should.equal(something); });

is possible test that?


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