How to test a Websocket connection in javascript using a mock

I have package for creating Websocket connections (rather simplified version of what I am trying to test):

(function() {

    window.ConnectionFactory.connect = function (url, onConnect) {
        this.ws = new WebSocket(url);
        this.ws.onopen = function () {
            // do some stuff
            onConnect(this.ws);
        };
    }

}).call(this);

I want to test two things in this function

1. The web socket is created with the given url.
2. The on connect callback is invoke.

So I wrote this test

describe('Test Connect', function() {
    describe('Successfull connection', function () { 

        beforeEach(function () {

            function MockWebSocket(url) { 
                url = url;
                setTimeout(this.onopen, 0);
            }
            this.ws = spyOn(window, 'WebSocket').and.callFake(MockWebSocket);
            this.onConnectSpy = jasmine.createSpy();

            ConnectionFactory.connect(
                'url',
                this.onConnectSpy
            );
        });

        it('Should create websocket with the given url', function () {
            expect(this.ws).toHaveBeenCalled();
            expect(this.ws.calls.argsFor[0]).toEqual('url');
        });        

        it('Should call onConnect callback', function () {
            expect(this.onConnectSpy).toHaveBeenCalled();
        });

    });

});

Both test fail and i'm a bit lost. Appreciate any help with this. Thanks.