Testing Angular Translation - Struggling with injecting $translateProvider

I'm currently facing an issue with my unit test using ES6, AngularJS, Karma/Jasmine, and angular-translate. It seems that I'm unable to get my unit test to pass. I'm not very familiar with how to handle 3rd party modules, such as angular-translate, during unit testing. Below is the code snippet along with the error message I'm encountering. The issue seems to be with the $translateProvider not loading properly.

import CatalogueModule from './catalogue.module'
import CatalogueService from './catalogue.service'

let service,
    _$translateProvider;

describe('CatalogueService', () => {
  beforeEach(angular.mock.module(CatalogueModule));

  beforeEach(() => {
    angular.mock.module({
      $translateProvider: jasmine.createSpyObj('$translateProvider',
        ['translations', 'preferredLanguage']
      ),
      $translate: jasmine.createSpyObj('$translate',
        ['use']
      )
    });
  })

  beforeEach(inject(($translateProvider) => {
    _$translateProvider = $translateProvider;

    _$translateProvider.translations('en', {});
    _$translateProvider.preferredLanguage('en');

    // service = new CatalogueService();
  }));

  it('should set the config object after initialization', inject(($translateProvider, CatalogueService) => {
    // $translateProvider.use.and.returnValue();
    // expect(service.config.headers).to.equal(null);
  }));
});

This is the error message I'm seeing:

✖ "before each" hook: WorkFn for "should set the config object after initialization"
      Chrome 59.0.3071 (Mac OS X 10.12.3)
    Error: [$injector:unpr] Unknown provider: $translateProviderProvider <- $translateProvider

UPDATE - including catalogue.service.js

class CatalogueService {
  constructor($http, $q, $translate) {
    'ngInject';

    this._$http      = $http;
    this._$q         = $q;
    this._$translate = $translate;

    this.config = {
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'Accept': '******',
        'P3-APP-ID': '*****',
        'P3-Date': '*****'
      }
    };

    this.catalogue = this.getCatalogue();
  }

  getCatalogue() {
    const lang = this._$translate.use();
    const url = `https://somedomain.com/catalog?language_code=${lang}`;
    const deferred = this._$q.defer();

    this._$http
      .get(url, this.config)
      .then(
        (res) => deferred.resolve(res.data.characters),
        (err) => deferred.reject(err)
      );

    return deferred.promise;
  };

  getCharacterByCharId(charId) {
    return this.catalogue
      .then((res) => {
        return res.find((character) => {
          return character.link_name === charId;
        });
      });
  };
}

export default CatalogueService;

Answer №1

One important thing to note in this test is the absence of the code:

beforeEach(angular.mock.module(...))

This indicates that only the ng and ngMock modules are loaded in the current test, and the $translateProvider service is not available.

When testing Angular units, it is recommended to instantiate them with Dependency Injection (DI) rather than directly. This approach allows for testing both the service annotation and the internal class functionalities.

Keeping unit tests isolated and focusing solely on the unit being tested is crucial, particularly when dealing with third-party libraries. If the units being tested rely on the $translateProvider, it is preferable to replace it with a mock or a stub:

beforeEach(angular.mock.module('moduleThatContainsCatalogueService');

beforeEach(() => {
  angular.mock.module({
    $translateProvider: jasmine.createSpyObj('$translateProvider',
      ['translations', 'preferredLanguage', 'use']
    )
  });
})

it('...', inject(($translateProvider, catalogueService) => {
  $translateProvider.use.and.returnValue(...);
  ...
}));

Answer №2

I have successfully implemented a custom loader for the $translateProvider in the past. Although the following example is in TypeScript, a similar approach should work for your needs:

angular.mock.module(($provide: angular.auto.IProvideService, translateProvider: angular.translate.ITranslateProvider) => {
    $provide.factory('customLoader', ($q: angular.IQService) => 
        () => {
            const deferred = $q.defer();
            deferred.resolve({});
            return deferred.promise;
    });

    $translateProvider.useLoader('customLoader');
});

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