How can you use cookies with superagent?

I'm doing cookie session management with express with something like this:

req.session.authentication = auth;

And I verify the authenticated urls with something like

if(!req.session.authentication){res.send(401);}

Now I'm building tests for the URLs with mocha, superagent and should, however I can't seem to find a way to get/set the cookie with superagent. I even tried to request the login before the authenticated test but it is not working,

I have tried adding the request to the login in the before statement for the mocha BDD suite, however it is still telling me that the request is unauthorized, I have tested the authentication doing the requests from the browser, however it is not working from the suite any ideas why?