people-test.js

test('renderTemplate sets application.duringQuestionSteps to true',
     function(assert) {
  var route = this.subject(),
      applicationController = route.controllerFor('application'),
      didRender;

  // http://discuss.emberjs.com/t/test-isolation-aka-how-wrong-am-i-doing-it/7162/2
  route.render = function mockRender(route) {
    didRender = true;
  };

  route.send('renderTemplate');

  assert.equal(applicationController.get('duringQuestionSteps'), true);
  assert.ok(didRender, 'expected to render');
});

Figured it out thanks to http://weichienhung.github.io/blog/2014/03/08/unit-testing-in-emberjs/.

Rather than do this:

route.send('renderTemplate');

I needed to do this:

route.renderTemplate();