Unit testing an arbitrary Ember.Object

Client.js

export default Ember.Object.extend({
  location: function() {
    return new Ember.RSVP.Promise(function(resolve, reject) {
      //Simulate some async operation
      Ember.run.later(function() {
        resolve({lat: "123", lon: "234", city: "London"});
      }, 2000);
    });
  }
});

UnitTest.js

import { test } from 'appkit/tests/helpers/module-for';

import Client from 'appkit/clients/location';

module('Unit - LocationClient', { }); 

test("it returns the lat, long and city", function() {
  //expect(3);

  var subject = Client.create(),
      result;

  Ember.run(function() {
    result = subject.location();
  });
  
  //If I do it this way, the assertions don't wait for the location() Promise to resolve, obviously
  equal(result.lat, "123");
  equal(result.lon, "234");
  equal(result.city, "London");

  //So I tried this...Now the test waits for the location() Promise to resolve, but I get errors
  //saying that lat, long, city were undefined.  Makes sense because result is a Promise
  andThen(function() {
    equal(result.lat, "123");
    equal(result.lon, "234");
    equal(result.city, "London");
  });
  
  //So then I tried this.  But again, the test doesn't wait for the Promise to resolve and therefore,
  //no assertions are made.
  result.then(function(payload) {
    equal(payload.lat, "123");
    equal(payload.lon, "234");
    equal(payload.city, "London");
  });
});