Angular 如何在角单元测试中模拟组件中的store.pipe

我是angular的新手，因为我曾尝试对一个从存储中获取数据的组件进行单元测试。我模拟了服务文件和商店。 当我尝试运行测试时，我得到如下错误。因此，我向存储添加了一些虚假数据并传递了数据。但我仍然遇到了同样的问题

Cannot read property 'switches' of undefined

规格文件

describe('SwitchListComponent', () => {
  let component: ListComponent;
  let fixture: ComponentFixture<ListComponent>;

  let store: Store<any>;
  const switchData = {
    switches: [
      {
        availability: true,
        created_at: "2020-01-30T05:06:06.366Z",
        description: "1",
        hardware_id: "2",
        id: 1018,
        max_flows: 2,
        name: "2",
        updated_at: "2020-01-30T05:34:36.702Z"
      }
    ],
    pagination: {
      currentPage: 1,
      endAt: 10,
      nextPage: 2,
      perPage: 10,
      prevPage: null,
      startAt: 1,
      totalCount: 1012,
      totalPages: 100
    }
  };


  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        ListComponent,
        MultiSelectComponent,
      ],
      imports: [
        RouterTestingModule,
        FormsModule,
        StoreModule.forRoot({ switchesReducer }),
      ],
      providers: [
        {provide: SwitchesService, useClass: SwitchesServiceStub},
      ]
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(ListComponent);
    component = fixture.componentInstance;
    store = fixture.debugElement.injector.get(Store);
    store.dispatch({
      type: 'FETCH_SWITCHES',
      payload: {
        switches: switchData.switches,
        pagination: switchData.pagination
      }
    });
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});

---

有谁能告诉我如何对规范中的this.store.pipe.

进行模拟。ts请尝试更改以下代码

StoreModule.forRoot({ switchesReducer }),

到

有关更多信息，请参阅文档

---

在规范内。ts尝试更改以下代码

StoreModule.forRoot({ switchesReducer }),

到

有关更多信息，请参阅文档

StoreModule.forRoot({ switches: switchesReducer }),