用玩笑/角度测试injectionToken不起作用

Question

我有服务

import { HUNT_SERVICE } from '../../home/home.module';

@Injectable()

export class SupportsService {

    private listOfScannedSupports: Observable<PortableObjectResult>[] = [];

    constructor(@Inject (HUNT_SERVICE) private huntService: IHuntService) {}

使用injectionToken定义和提供如下内容：

export const HUNT_SERVICE = new InjectionToken<IHuntService>('HuntService');
...
  providers: [
    {
        provide: HUNT_SERVICE,
        useClass: HuntService
    },
    SupportsService
  ]

效果很好。

我试图像这样在Jest中测试SupportsService：

import { HUNT_SERVICE } from '../../home/home.module';
import { SupportsService } from './supports.service';

describe('SupportsService', () => {
    let supportsServiceTest: SupportsService;
    let huntService: IHuntService;

    const mockHuntService = {
        startHuntThenReadPortableObject: jest.fn(query => mockPortableObjectReturn),
    };

    beforeEach(
        waitForAsync(() => {
            TestBed.configureTestingModule({
                providers: [
                    SupportsService,
                    { provide: HUNT_SERVICE, useValue: mockHuntService },
                ],
            }).compileComponents();
        }),
      );

    beforeEach(() => {
        supportsServiceTest = TestBed.inject(SupportsService);
        huntService = TestBed.inject(HUNT_SERVICE);
    });

    it('should be created', () => {
        expect(supportsServiceTest).toBeTruthy();
    });

启动测试时出现此错误：

src/renderer/app/features/supports/services/supports.service.spec.ts (7.707 s)
  ● SupportsService › should be created

    NullInjectorError: R3InjectorError(DynamicTestModule)[SupportsService -> undefined -> undefined]:
      NullInjectorError: No provider for undefined!

      at NullInjector.Object.<anonymous>.NullInjector.get (../packages/core/src/di/injector_compatibility.ts:246:21)

我不明白我错过了什么！