Testing sessions with ember-cli-simple-auth-testing

I have an app that uses ember-cli-simple-auth. I've set up ember-cli-simple-auth-testing, but the session information is empty. How do I go about adding information to the current session?

All of the failing tests use this property:

// controllers/current-user.js
currentUser: function() {
  return this.get('session.account');
}.property('session.account')

This is a failing test:

module('Integration - Favorites', {
  beforeEach: function() {
    App = startApp();
    server = setupPretender(); // a helper that sets up Pretender
    authenticateSession();
  },
  afterEach: function() {
    Ember.run(App, 'destroy');
    server.shutdown();
  }
});

test('user can favorite a project', function(assert) {
  visit('/collaborate');
  click('.favorite');

  andThen(function() {
    // asserts that there is a span with the class .fa-star
  });
});

This is the code it tests:

// controllers.projects.js
actions: {
  updateFavorites: function(id, isSelected) {
    var user = this.get('currentUser'); // this is defined in the app, but not during tests
    user.then(function(user) {
      var favorites = user.get('favorites');

      if (isSelected) {
        favorites.pushObject(id);
      } else {
        favorites.removeObject(id);
      }

      user.set('favorites', favorites);
      user.save();
    });
  }
}

When I run that test, I get this error message:

not ok 1 PhantomJS 1.9 - Integration - Favorites: user can favorite a project
    ---
        actual: >
            false
        expected: >
            true
        message: >
            TypeError: 'undefined' is not an object (evaluating 'user.then')
        Log: >
    ...

I saw that there is a helper in ember-simple-auth-testing called currentSession, but if I try to add it, I get ReferenceError: currentSession is not defined.

How would I set the test's session? Why is the currentSession function not available?

Versions:

ember: 1.10.0
ember-cli: 0.1.12
ember-cli-simple-auth: 0.6.7 (also tried 0.7.3)
ember-cli-simple-auth-testing: 0.6.7 (also tried 0.7.3)
node: 0.10.33
npm: 2.1.6