Keeping Ember app running after last TestEm integration test

I'm using a Ember-Cli app which uses Testem/Qunit, and my test run fine.

However after the last test test, TestEm closes the Ember app and I am left with a white screen in the TestEm app window. Is there a way to keep this running in the app window?

I've tried commenting out the tear down but that doesn't work.

    module('Integration Tests', {
      setup: function () {
        App = startApp();
      }
/*
     ,
      teardown: function () {
        Ember.run(App, App.destroy);
      }
*/
    });

    test("Checking  page", function () {
      App.reset();
      expect(1);
      visit('/hub');

      andThen(function () {
        equal(find('#btnLogin').length, 1, 'The page shows a login link');
      });
    });