auth-service.spec.ts

import { inject, TestBed } from '@angular/core/testing';
import { Subject } from 'rxjs/Subject';
import { AuthProviders, FirebaseAuth, FirebaseAuthState } from 'angularfire2';
import { AuthService } from './auth-service';


const fbAuthMethods = [
  'subscribe'
  // ... etc
];


describe('auth/', () => {
  describe('AuthService', () => {
    let authService;
    let authSubject;
    let mockFirebaseAuth;

    beforeEach(() => {
      authSubject = new Subject<FirebaseAuthState>();

      mockFirebaseAuth = jasmine.createSpyObj('fbAuth', fbAuthMethods);
      mockFirebaseAuth.subscribe.and.callFake(callback => {
        authSubject.subscribe(callback);
      });

      TestBed.configureTestingModule({
        providers: [
          {provide: FirebaseAuth, useValue: mockFirebaseAuth},
          AuthService
        ]
      });

      inject([AuthService], (service: AuthService) => {
        authService = service;
      })();
    });

    it('should be defined', () => {
      expect(authService).toBeDefined();
    });

    it('should subscribe to auth state changes', () => {
      expect(authService.authState).toBe(null);

      let authData = {
        uid: '12345',
        provider: AuthProviders.Github,
        auth: {
          displayName: 'John Doe',
          providerId: 'github.com'
        }
      } as FirebaseAuthState;

      authSubject.next(authData);
      expect(authService.authState).toBe(authData);
    });
  });
});