promiseSession.js

var token = null;

Session.generate({ user: 'stephen' }).then(function(result) {

  session.set('expirationTime', Date.now());
  token = result.token;

  return session.save();

}).then(function() {

  // re-fetch
  return Session.load(token);

}).then(function(fetchedSession) {

  // do something with the newly fetched instance
  assert.equals(fetchedSession.get('user'), 'stephen');

  return fetchedSession.delete();

}).done();