Question

我有一个非常简单的组件，如下所示。请承担所有相关进口。

//my-component.component.ts
//imports, decorator, etc.
routingNumber: number;
ngOnInit() {
    this.route.params.subscribe(
      params => {
    this.routingNumber = +params['id'];
      }
    );
}

我还有一个测试文件，如下所示。再一次，请假设所有相关的进口声明。我有一个用模拟的ActivateRoute代替实际的ActivatedRoute，并带有关联的observable。我给人的印象是，调用fix.onChanges（）会运行ngOnInit，并将routingNumber属性值设置为可观察对象传递的值，但是在运行测试时，它始终返回undefined。

//my-component.component.spec.ts
//imports, describe, etc.

class mockActivatedRoute {
params = {
  subscribe() {
    return of({id: '1'});
  }
}

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [
      NoteService,
      {provide: ActivatedRoute, useClass: mockActivatedRoute},
      {provide: DataStorageService, useValue: dataServiceStub}
    ],
    declarations: [MyComponent],
    schemas: [NO_ERRORS_SCHEMA]
  }).compileComponents();
});

beforeEach(() => {
  fixture = TestBed.createComponent(MyComponent);
  component = fixture.componentInstance;
});

it('should expect 1 as the route parameter', async(() => {
  fixture.detectChanges();
  expect(component.routingNumber).toEqual(1); 
});

Answer 1

您可以尝试--

params = of({id: '1'});

params.subscribe(  params => { console.log(params)
})

NgOnInit未订阅茉莉花测试中的嘲笑激活中的observable

1 个答案: