Using Typescript to test with Karma, we can inject a service for our

I'm currently experiencing a problem with running tests in my application. I recently transitioned to using TypeScript and am still in the learning process.

The specific error I'm encountering is:

Error: [$injector:unpr] Unknown provider: movieProvider <- movie

movie.spec.ts

import { MovieService } from './movie';

describe('service MovieService', () => {
  let movieService: MovieService;

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

  it('should be registered', inject((movie : MovieService) => {
    expect(movie).not.toBeNull();
  }));
});

movie.ts

/** @ngInject */
export class MovieService {
  static $inject = ['$log', '$http', 'LoaderManager'];
  public apiMovieDetail: string = 'http://www.omdbapi.com/';

  /** @ngInject */
  constructor(private $log: angular.ILogService, private $http: angular.IHttpService, private loader: LoaderManager) {
  }

  public getMovie(id: string): angular.IPromise<IMovie> {
    this.loader.add();
    return this.$http.get(this.apiMovieDetail + '?plot=short&r=json&i=' + id).then((response: any): any => {
        this.loader.remove();
        return response.data;
      })
      .catch((error: any): any => {
        this.loader.remove();
        this.$log.error('XHR Failed for getMovie.\n', error.data);
      });
  }

}

Successfully injecting the controller using the following code:

beforeEach(inject(($controller: angular.IControllerService) => {
    mainController = $controller('MainController');
}));

Answer №1

The following code snippet demonstrates the working injection method by directly injecting the MovieService.

  beforeEach(inject((MovieService: MovieService, $httpBackend: angular.IHttpBackendService, $log: angular.ILogService) => {
    movieService = MovieService;
    httpBackend = $httpBackend;
    log = $log;
  }));

However, an issue arises when attempting to utilize injection within the "it" block as shown below:

  it('should be registered', inject((movie : MovieService) => {
    expect(movie).not.toBeNull();
  }));

In this case, the second MovieService cannot be resolved. The solution is to use the previously defined movieService variable from the first example like so:

beforeEach(inject((movieService: MovieService) => {
    movieService = $httpBackend;
}));

it('should be registered', inject(() => {
    expect(movieService).not.toBeNull();
}));

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