undefined is not an object (evaluating 'this.get('i18n').t') , Error while qunit testing ember app usuing i18n translations

Here's my code which works fine.

    export default Route.extend({
  beforeModel() {
    this.controllerFor('myreusable-template').set('currentStep', 'prepare_data');
  },

  afterModel(model) {
    if (model.get('roles.length') === 0) {
      model.newRole({
        name: this.get('i18n').t('routes.myreusableTemplate.addRoles.user1')
      });
    }
  }
});

here are my test case file imports

import { moduleFor, test } from 'ember-qunit';
import Ember from 'ember';
import tHelper from 'ember-i18n/helper';
import localeConfig from 'ember-i18n/config/en';

moduleFor('controller:myreusable-template/my-file', {
  unit: true,
  needs: ['service:layoutSizeData',
    'service:i18n',
    'locale:en/translations',
    //'locale:en/config',
    'util:i18n/missing-message',
    'util:i18n/compile-template',
    'config:environment'],
  beforeEach() {
    this.container.lookup('service:i18n').set('locale', 'en');
    this.registry.register('locale:en/config', localeConfig);
    this.registry.register('helper:t', tHelper);
  }
});

And this is the error I am getting while executing the file.

undefined is not an object (evaluating 'this.get('i18n').t').

I am following the i18n doc to write the imports but it still not working. I am using ember ember-cli: 2.12.3, "ember-i18n": "5.0.1".