Nsryjdtyk

I am testing AuthService which sends user login info to server using another HelperService.

public authServiceSigninUser(user:UserSigninInfo):any{

    console.log('In authServiceSigninUser. contacting server at '+this.API_URL +this.SIGNIN_USER_URL +" with user data "+user+ " with httpOptions "+httpOptions.withCredentials + ","+httpOptions.headers ); //TODOM password should be sent in encrypted format.



    let signinInfo= new UserSigninAPI(user);

    let body = JSON.stringify(signinInfo);

    return this.helperService.sendMessage(this.SIGNIN_USER_URL,body,httpOptions)

  }

I am trying to test the authServiceSigninUser method as follows but when I run the spec, I get error Error: <spyOn> : sendMessage() method does not exist
Usage: spyOn(<object>, <methodName>). Why?

describe('authServiceSigninUser test suite',()=>{

  beforeEach(()=>{

    TestBed.configureTestingModule({

      imports: [HttpClientTestingModule],

      providers: [AuthService, HelperService]

    });

  });

  fit('should sign in user',()=>{

    let spy:any;

    let helper = TestBed.get(HelperService);

    let authService = TestBed.get(AuthService);

    let userSignIn = new UserSigninInfo("test@test.com","test");

    let httpMock = TestBed.get(HttpTestingController);

    spyOn(helper.sendMessage,'sendMessage');

    let observable:Observable<HttpEvent<any>> = authService.authServiceSigninUser(userSignIn);

    let subscription = observable.subscribe((event)=>{

      console.log('event from authService',event);

    });

    const responseData = { result: 'success', ['additional-info']: 'login success' };

    let httpEvent:HttpResponse<any> = new HttpResponse<any>({body:responseData});

    expect(helper.sendMessage).toHaveBeenCalled();//ERROR here

    const mockReq:TestRequest = httpMock.expectOne(environment.apiUrl+environment.signinUserUrl); //Expect that a single request has been made which matches the given URL, and return its mock

    //once mocking of sending request is done, mock receiving a response. This will trigger the logic inside subscribe function

    mockReq.flush(httpEvent); //flush method provides dummy values as response

    httpMock.verify();//verify checks that there are no outstanding requests;



  });

});

It seems the correct way is spyOn(helper,'sendMessage');, not spyOn(helper.sendMessage,'sendMessage');