import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

export default function startApp(attrs) {
  let application;

  // use defaults, but you can override
  let attributes = Ember.assign({}, config.APP, attrs);

  Ember.run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

export default function startApp(attrs) {
  let application;
  let assign = Ember.assign || Ember.merge

  // use defaults, but you can override
  let attributes = assign({}, config.APP, attrs);

  Ember.run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

Fix tests for ember v2.4.x