组件“失败：未捕获（承诺）：TypeError：”的Angular7集成测试：

Question

我不断收到此错误，并且已经遍历文档和各种线程，无法弄清楚为什么会发生这些错误，因为它们毫无意义。

我的规格配置有1个简单测试：

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

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        ReactiveFormsModule,
        HttpClientModule,
        MatSnackBarModule,
        FormsModule
      ],
      declarations: [AddVideoComponent, CleanLinkPipe],
      providers: [RestService, NgRedux, AdalService],
      schemas: [NO_ERRORS_SCHEMA]
    })
      .compileComponents()
      .then(() => {
        fixture = TestBed.createComponent(AddVideoComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
      });
  }));

  it('should create form group with 5 controls', () => {
    component.ngOnInit();
    fixture.detectChanges();
    expect(component.addVideoForm.contains('title')).toBeTruthy();
  });
});

我遇到的错误：

Failed: Uncaught (in promise): TypeError: Cannot read property 'subscribe' of undefined

+

 TypeError: Cannot read property 'ngOnInit' of undefined

现在在我的组件中，我没有以任何方式订阅任何东西，没有任何类型的订阅。