Angular6 how to test a sequence of http requests

I've created a service to getting user information from django rest auth. So I need 2 separate requests. one for getting auth token and one for getting user info.

In the userService service, I have a method called login that calls 2 other methods. Each of them sends a http request to a different url. For testing the behavior of login, I need to mock the requests of that 2 methods. First method returns a Promise that includes authentication key, and second method returns a Promise that includes user object. Here is my code in the service class:

public getAuthToken(identifier: string, password: string) {
  const requestBody = is_valid_email(identifier) ? {email: identifier, password: password} :
                                                 {username: identifier, password: password};
  let savedToken = getFromStorage('auth');
  if (savedToken) {
    try {
      savedToken = JSON.parse(savedToken);
    } catch (e) {
      savedToken = null;
    }
  }
  return new Promise((resolve, reject) => {
    if (savedToken) {
      resolve(savedToken);
    } else {
      this.http.post<string>(APIUrlSolver.login, requestBody).subscribe(data => {
        const dataObj = JSON.parse(data);
        UserService._auth_token = dataObj['key'];
        resolve(dataObj['key']);
      }, error1 => {
        // Rejection code. removed for better reading
      });
    }
  });
}

public getUserProfile(): Promise<UserModel> {
  return new Promise<UserModel>((resolve, reject) => {
    this.http.get(APIUrlSolver.user).subscribe((data: string) => {
      const jsonData = JSON.parse(data);
      const userObj = new UserModel(jsonData.username, jsonData.email, jsonData.first_name, jsonData.last_name, jsonData.phone,
        jsonData.birth_date);
      UserService._user = userObj;
      resolve(userObj);
    }, error1 => {
      // Rejection code. removed for better reading
    });
  });
}

public login(identifier: string, password: string) {
  return new Promise((resolve, reject) => {
    this.getAuthToken(identifier, password).then(key => {
      this.getUserProfile().then(user => {
        // Will resolve user object
      }).catch(error => {
        UserService._auth_token = undefined;
        reject(error);
      });
    }).catch(reason => {
      UserService._auth_token = undefined;
      reject(reason);
    });
  });
}

I've tried to test this method with following code:

      describe('userService', () => {
  let userService: UserService;
  let httpClient: HttpTestingController;
  const mockedUser = new UserModel();
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [UserService]
    });
    userService = TestBed.get(UserService);
    httpClient = TestBed.get(HttpTestingController);
  });

  afterEach(() => {
    httpClient.verify();
  });

    it('#login', () => {
    const authResponse = {key: '74f0d5ffb992f5f49533d25c686f36414e64482c'};
    const response = {username: 'daaaaaaab', email: 'test@test.ir', first_name: 'test', last_name: 'test', phone: '09123657894',
      birth_date: '2018-07-31'};
    const expectedUser = new UserModel(response.username, response.email, response.first_name, response.last_name, response.phone,
      response.birth_date);

    userService.login('identifier', 'password').then(user => {
      expect(user).toEqual(expectedUser);
      expect(userService.user).toEqual(expectedUser);
      });

    const req = httpClient.expectOne(APIUrlSolver.login);   // This response works correct
    expect(req.request.method).toBe('POST');
    req.flush(JSON.stringify(authResponse));

    const userReq = httpClient.expectOne(APIUrlSolver.user);    // I get error here
    expect(req.request.method).toBe('GET');
    userReq.flush(JSON.stringify(response));
    });

     });

But this code will always faild on userReq. because expectOne raises:

 Error: Expected one matching request for criteria "Match URL: /user/user/", found none.

The real question is how I can test this sequence of http requests Because HttpClientTestingModule did not work

from Angular6 how to test a sequence of http requests