Ember .getJSON testing issue

I created an Ember service that polls an API every second using getJSON. The code works fine in the browser but when I try to run tests on I am getting all sorts of errors including You have turned on testing mode, which disabled the run-loop's autorun. You will need to wrap any code with asynchronous side-effects in a run and Test timed out. Is my Ajax call interacting with ember improperly? I can't seem to get the tests to run right.

schedulePollEvent(event, interval) {
 var eventInterval = interval || this.get('eventInterval');

 return Ember.run.later(() => {
  event.apply(this);
  this.set('timer', this.schedulePollEvent(event));
 }, eventInterval);

},

startPolling(interval) {
 this.set('timer', this.schedulePollEvent(this.get('onPollEvent'), interval));
},

stopPolling() {
 Ember.run.cancel(this.get('timer'));
},

onPollEvent() {

  Ember.$.getJSON('url', 'GET')
    .then((data) => {
        Ember.run(() => {
          // Do something
        });
    }, (err) => {
      console.log("Error hitting 'url': " + err);
    }
  );

}