Angular2：使用Route resolve对组件进行单元测试

Question

我有一个依赖于Route Resolve数据的组件。 以下是路由器的代码片段

           {
                path: 'attachment',
                component: SgCreateAttachmentComponent,
                resolve: {
                    referenceData: SgCreateAttachmentResolve
                },
                data: {
                    'seq' : 5
                },
                canActivate: [SgCreateCanActivateGaurd]
            }

在组件内部，我在ngOnInit中获取解析数据。

ngOnInit() {

    this.standardAttachmentCategories = this._activatedRoute.snapshot.data['referenceData'].json();

   }

我正在尝试对组件的ngOnInit函数进行单元测试。以下是我的规范中的代码段。

it('should ensure ngOnInit is called', () => {
    fixture.detectChanges();
});

另外，我有以下配置的试验台

beforeEach(async(() => {

        TestBed.configureTestingModule({
            imports: [HttpModule, SgCreateModule],
            providers: [FormBuilder, { provide: SgCreateService, useClass: SgCreateMockService },
                { provide: SgCreateAttachmentService, useClass: SgCreateAttachmentServiceMock },
                SgCreateModelService,
                { provide: Router, useClass: RouterStub },
                  { provide: ActivatedRoute, useClass: ActivatedRouteStub },
                { provide: XHRBackend, useClass: MockBackend }
            ]
        })
            .compileComponents();
        fixture = TestBed.createComponent(SgCreateAttachmentComponent);
        comp = fixture.componentInstance;



    }));

但是，执行上述测试会引发错误：

无法读取未定义

的属性'referenceData'

我也尝试了以下

  it('should ensure ngOnInit is called', () => {
        const activatedRouteStub = fixture.debugElement.injector.get(ActivatedRoute);
        activatedRouteStub.testParams = { data: new Response() };
        fixture.detectChanges();
    });

但我面临同样的问题。