Angular 8 karma test a service without injecting all service in the constructor

I'm new to Angular testing with Karma and I'm not understanding how to properly test a service. Let's say I have this service that I have to test:

@Injectable()
export class MyService {
    constructor(private httpService: HttpService) { }

    //methods to test
}

and this is my test class:

describe('MyService', () => {
  let service: MyService;
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      providers: [MyService],
    }).compileComponents();
    service = TestBed.get(MyService);
  }));
});

When I run ng test it gives the error NullInjectorError: No provider for HttpService!.
So I add HttpService into providers array in test class, this way:

describe('MyService', () => {
  let service: MyService;
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      providers: [MyService, HttpService],
    }).compileComponents();
    service = TestBed.get(MyService);
  }));
});

HttpService is this:

@Injectable()
export class HttpService{
    constructor(private httpService: HttpClient) { }
}

So now I get the error NullInjectorError: No provider for HttpClient!. (HttpClient is from @angular/common/http).
If I add HttpClient to providers array in test class then I get the same error for all the services/class inside HttpClient constructor, and so on. What is the correct way to instatiate a service, without having to add each providers, leading to potential infinite providers?