在angular2中使用ts-mockito模拟getter

Question

我有一项服务

​

@Injectable()
export class MyService {
    private _id: string;
    get id(): string {
        return this._id;
    }
}

​

以及一个组件的测试，我想在其中模拟这个服务：

​

let myServiceMock = mock<MyService>(MyService);
when(myServiceMock.id).thenReturn('mockId');

TestBed.configureTestingModule({
    imports: [
        MyModule
    ],
    providers: [
        {
            provide: MyService, useValue: instance(myServiceMock)
        }

    ]
});

​

当测试运行时，我将undefined作为一个id。

可以通过mockito来模拟getter吗？

Answer 1

看起来这就是TestBed.configureTestingModule的工作方式。它重新定义了作为useValue提供的所有依赖项。

解决方案是使用useFactory

​

let myServiceMock = mock<myServiceMock>(MyService);
when(myServiceMock.id).thenReturn('mockId');

TestBed.configureTestingModule({
    imports: [
        MyModule
    ],
    providers: [
        {
            provide: MyService, useFactory: () => instance(myServiceMock)
        }

    ]
});

​