gistfile1.js

//make + mocker + jasmine
it('should register component (single ID)', function(done) {
    socket = io('http://localhost:' + port);

    socketService.io.sockets.in('component1').emit('foobar', { foo: 'baz' });

    socket.once('registerComponent', function(data) {
        socketService.io.sockets.in('component1').emit('foobar', { foo: 'bar' });
    });

    socket.once('foobar', function(data) {
        data.should.eql({
            foo: 'bar'
        }, 'Socket got component broadcast before registering!');

    done();
});

socket.emit('registerComponent', {
    id: 1
});