Injected service undefined while test runs

Testing
1

I injected mock service to test, but while I run this test, the service is undefined. But in console log I see it.

Component

  didInsertElement: function () {
    this._super(...arguments);
    let self = this;

    _moment = this.get('datetimeService').getMoment();

Test

const datetimeService = Ember.Service.extend({
  getDateTime(){
   return {rangeStart: 1478003235171, rangeEnd: 1478006835170};
  },
  getMoment(){
    return  window.moment;
  }
});

moduleForComponent('date-time', 'Integration | Component | date time', {
  integration: true,
  beforeEach: function () {
    this.register('service:datetime-service', datetimeService);
    this.inject.service('datetime-service', { as: 'datetimeService' });
  }
});

test('it renders', function(assert) {
  assert.expect(1);

console.log('k moment:: ', this.get('datetimeService').getMoment());

  this.render(hbs`
    {{date-time}}
  `);

  assert.ok(this.$('#reportrange'));
});