单元测试使用AngularFireAuth和模拟authState的服务

我试图找到一种方法来模拟或高举Observable AngularFireAuth.authState而不是实际与Firebase交谈的服务.

这是我的测试规范：

import { inject,TestBed } from '@angular/core/testing';

import { AngularFireModule } from 'angularfire2';
import { AngularFireAuth,AngularFireAuthModule } from 'angularfire2/auth';
import * as firebase from 'firebase/app';
import 'rxjs/add/observable/of';
// import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { Observable } from 'rxjs/Rx';

import { AuthService } from './auth.service';
import { environment } from '../../environments/environment';

const authState: firebase.User = null;
const mockAngularFireAuth: any = { authState: Observable.of(authState) };

describe('AuthService',() => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [AngularFireModule.initializeApp(environment.firebaseAppConfig)],providers: [
        { provider: AngularFireAuth,useValue: mockAngularFireAuth },AuthService
      ]
    });
  });

  it('should be defined',inject([ AuthService ],(service: AuthService) => {
    expect(service).toBeDefined();
  }));

  it('.authState should be null',(service: AuthService) => {
    expect(service.authState).toBe(null);
  }));
});

这是我的(简化)服务：

import { Injectable } from '@angular/core';

import { AngularFireAuth } from 'angularfire2/auth';
import * as firebase from 'firebase/app';
import { Observable } from 'rxjs/Rx';

@Injectable()
export class AuthService {
  private authState: firebase.User;

  constructor(private afAuth: AngularFireAuth) { this.init(); }

  private init(): void {
    this.afAuth.authState.subscribe((authState) => {
      if (authState === null) {
        this.afAuth.auth.signInAnonymously()
          .then((authState) => {
            this.authState = authState;
          })
          .catch((error) => {
            throw new Error(error.message);
          });
      } else {
        this.authState = authState;
      }
    },(error) => {
      throw new Error(error.message);
    });
  }

  public get currentUser(): firebase.User {
    return this.authState ? this.authState : undefined;
  }

  public get currentUserObservable(): Observable<firebase.User> {
    return this.afAuth.authState;
  }

  public get currentUid(): string {
    return this.authState ? this.authState.uid : undefined;
  }

  public get isAnonymous(): boolean {
    return this.authState ? this.authState.isAnonymous : false;
  }

  public get isAuthenticated(): boolean {
    return !!this.authState;
  }

  public logout(): void {
    this.afAuth.auth.signOut();
  }
}

我得到错误属性’authState’是私有的,只能在类’AuthService’中访问.

当然是,但我不想实际访问它 – 我想模拟或劫持它,所以我可以从我的测试规范中控制它的价值.我相信我的代码在这里偏离了我的道路.

请注意我使用的是AngularFire2的版本^ 4,并且引入了重大更改;记录在这里：https://github.com/angular/angularfire2/blob/master/docs/version-4-upgrade.md