Angular Testing Snippets: Services over HTTP

feature.service.spec.ts

describe(`FeatureService`, () => {
  /** ... set up ... **/

  it(`should emit 'false' for 401 Unauthorized`,
    async(inject([ FeatureService, MockBackend ],
                 (service: FeatureService, mockBackend: MockBackend) => {

      // 0. prepare fake response from `MockBackend`
      mockBackend.connections.subscribe((c: MockConnection) => {
        // 2a. expect `FeatureSerivice` to make a proper request
        expect(c.request.url).toBe('auth/login');
        expect(c.request.method).toBe(RequestMethod.Post);
        expect(c.request.headers.get('Content-Type'))
          .toBe('application/x-www-form-urlencoded');

        // 2b. expect request body to contain form data
        expect(c.request.getBody()).toBe(/* ... */);

        // 3. respond to `FeatureService` with a 401 Unauthorized
        c.mockRespond(new Response(new ResponseOptions({
          body: '',
          status: 401
        })));
      });

      // 1. dispatch the http request
      service.login('foo', 'bar')
        .subscribe((status: boolean) => {
          // 4. ensure that `FeatureService` reports login failure
          expect(status).toBeFalsy();
        });

    })));
 
});