错误：NullInjectorError：没有路由器提供程序

Question

我必须测试一个组件并收到此错误 NullInjectorError: R3InjectorError(DynamicTestModule)[AuthenticationService -> Router -> Router]: NullInjectorError: No provider for Router!**" 我正在测试的组件有两个依赖项，但我没有知道 hot 在测试中使用 testbed gallery.component.ts提供它们

constructor( private authService:AuthenticationService, private iterableDiffers: IterableDiffers){
        this.iterableDiffer = iterableDiffers.find([]).create(null);
    }

画廊.component.spec.ts

describe('GalleryComponent', () => {

    let component: GalleryComponent;
    let fixture: ComponentFixture<GalleryComponent>
    let authServiceMock: AuthenticationService
    let iterableDifferMock: IterableDiffers

    beforeEach(() => {
        TestBed.configureTestingModule({
        providers:[GalleryComponent, {provide:AuthenticationService}, {provide:IterableDiffers}]
    })
        

        fixture = TestBed.createComponent(GalleryComponent);
        component = fixture.componentInstance;

        authServiceMock = TestBed.inject(AuthenticationService)
    })
...

如何提供这两个依赖项？
我阅读了 Angular DOC，但没有找到解决方案，我在 SO 上提出了其他问题，但没有找到解决方案。
谢谢

Answer 1

只需将RouterTestingModule导入RouterTestingModule中的导入数组

TestBed.configureTestingModule({
  imports: [RouterTestingModule],
  providers:[
    GalleryComponent, 
    {provide:AuthenticationService}, 
    {provide:IterableDiffers}
  ]
})

Answer 2

您只需注入组件构造函数中的所有依赖项：

constructor( private authService:AuthenticationService, private iterableDiffers: IterableDiffers){}

如果您也需要使用 Angular 路由器：

constructor( private authService:AuthenticationService, private iterableDiffers: IterableDiffers, private router: Router){}

并且无需添加：

this.iterableDiffer = iterableDiffers.find([]).create(null);

之后，您可以调用并使用您想要的依赖项。