Angular2 如何模拟已订阅的激活路由参数

Question

我有一个从 ActivatedRoute 的 params 属性获取值的组件。

组件看起来像：

......
  constructor(public userRegistration: UserRegistrationService, public userLogin: UserLoginService,
              public router: Router, public route: ActivatedRoute) {
  }

  ngOnInit() {
    this.verificationCode = new FormControl('', [Validators.required]);
    this.confirmationCodeForm = new FormGroup({verificationCode: this.verificationCode});

    //****************************** 
    this.sub = this.route.params.subscribe(params => {
      this.email = params['userId'];
    });
   //******************************
    this.errorMessage = null;
  }
 ......

该测试提供了一个 ActivatedRoute 作为模拟该类的“useValue”。测试看起来像：

describe('ConfirmRegistrationComponent', () => {
  let component: ConfirmRegistrationComponent;
  let fixture: ComponentFixture<ConfirmRegistrationComponent>;
  let userRegistrationService: UserRegistrationService;
  let userLoginService: UserLoginService;
  let router: Router;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [ReactiveFormsModule, FormsModule, RouterTestingModule, HttpClientModule],
      declarations: [ConfirmRegistrationComponent],
      providers: [UserRegistrationService, UserLoginService, {

        provide: ActivatedRoute,
        useValue: {'params': Observable.from([{userId: 1}])}

      }, ImageService, UserService, CognitoUtil,
        {
          provide: Router, useClass: class {
            navigate = jasmine.createSpy('navigate');
          }
        }]
    }).compileComponents();

    fixture = TestBed.createComponent(ConfirmRegistrationComponent);
    component = fixture.componentInstance;
    userRegistrationService = TestBed.get(UserRegistrationService);
    userLoginService = TestBed.get(UserLoginService);
    spyOn(userLoginService, 'isAuthenticated').and.callFake(function () {

    });
    router = TestBed.get(Router);
    fixture.detectChanges();
    component.ngOnInit();
  }));

  it('should create', () => {
  });
});

当我运行测试时，我收到下一个错误：

Failed: Cannot read property 'subscribe' of undefined
TypeError: Cannot read property 'subscribe' of undefined
    at new RouterLinkWithHref node_modules/@angular/router/esm5/router.js:6099:1)

请问你能帮帮我吗？谢谢！

Answer 1

使用 RouterTestingModule 时，不应将 Router 提供程序放入 providers 集合（导入 RouterTestingModule 或提供 Router，但不能同时提供两者）。

此外，我不知道这是否会有所帮助，但我在 Angular 6 中遇到了一个相关问题，我不得不使用以下语法：

providers: [
    { provide: ActivatedRoute, useValue: {
            paramMap: of( convertToParamMap( { userId: 1 } ) )
        }
    }
],

convertToParamMap 在 @angular/Router