Testing admin user on Mocha

I'm writing tests, trying to use TDD with Mocha on an application that uses JWT for authentication. Basically admin and common users share the same User model, with a boolean admin field.

These are the routes:

app.post('/register', controllers.auth.create);
app.post('/login', controllers.auth.login);

router.get('/admin', function (req, res) {..[render admin login tpl]..}); 
router.post('/admin', isAuthenticated, isAuthorized, controllers.admin.index);

My question is, how to test an Admin user, I can't create on DB directly because i'm checking the token too (isAuthenticated). What's the best way to test it in Mocha?