typescript - Ionic + Jasmine + Tslint - 类型上不存在属性 'and'

Question

大家。我正在构建一个 Ionic 应用程序 boilerplate .
现在，我正在为特定页面构建测试，我正在使用 jasmine 来模拟提供程序并设置方法的预期行为。
就是这样的beforeEach() 方法看起来像:

    beforeEach(() => {
          mockLoadingController = jasmine.createSpyObj('ModalController', ['create', 'present', 'dismiss']);
          mockLoadingController.create.and.returnValue(mockLoadingController);

          mockModalController =  jasmine.createSpyObj('LoadingController', ['create', 'present',
            'onDidDismiss', 'dismiss']);
          mockModalController.create.and.returnValue(mockModalController);

          mockGeolocation =  jasmine.createSpyObj('Geolocation', ['getCurrentPosition']);

          mockGeolocation.getCurrentPosition.and.callFake(( ) => {
            return {then: ( ) => { }};
          });
          mockEvents = jasmine.createSpyObj('Events', ['publish', 'subscribe']);
          TestBed.configureTestingModule({
            schemas: [CUSTOM_ELEMENTS_SCHEMA],
            providers: [
              { provide: NavController, useValue: mockNavController },
              { provide: LoadingController, useValue: mockLoadingController },
              { provide: ModalController, useValue: mockModalController },
              { provide: Geolocation, useValue: mockGeolocation },
              { provide: Events, useValue: mockEvents },
              LocationPage,
            ],
          },
    ); } );

当我为 定义 promise 返回时，问题就开始了。获取当前位置 方法:

    mockGeolocation.getCurrentPosition.and.callFake(( ) => {
            return {then: ( ) => { }};
    });

我在测试时使用 tslint，它给了我以下错误

ERROR in [at-loader] ./src/pages/location/location.page.spec.ts:24:40 
    TS2339: Property 'and' does not exist on type '(options?: GeolocationOptions) => Promise<Geoposition>'.

问题是:我怎样才能克服这个问题，让 TSLint 不再提示这段代码？

Answer 1

实际上正确的类型是:

  let mockGeolocation: jasmine.SpyObj<Geolocation>;
  let mockEvents: jasmine.SpyObj<Events>;