Ionic + Jasmine + Tslint - 属性'和'在类型上不存在

Question

每一个人。我正在这个boilerplate上建立一个Ionic应用程序。现在，我正在构建特定页面的测试，我正在使用jasmine来模拟提供程序并设置方法的预期行为。这就是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getCurrentPosition方法定义promise返回时，问题就出现了：

    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：我如何克服这个问题，所以TSLint不再抱怨这个代码了？

Answer 1

问题解决了！我忘了详细说明我声明变量的方式：

describe('Location Page', () => {
  let mockLoadingController: any;
  let mockModalController: any;
  let mockGeolocation: Geolocation;
  let mockEvents: Events;
  beforeEach(() => {
  //rest of the code here

如您所见，我为mockGeolocation变量定义了一个类型，我确实将其他类型设置为any。将所有变量设置为与jasmine完美配合，并且它不会在tslint中生成错误。

所以正确的代码是这样的：

describe('Location Page', () => {
  let mockLoadingController: any;
  let mockModalController: any;
  let mockGeolocation: any;
  let mockEvents: any;
  beforeEach(() => {

Answer 2

实际上正确的类型将是：

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