unit testing service

profile.service.spec.ts

import { TestBed, async, inject } from '@angular/core/testing';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { HttpClientModule, HttpClient } from '@angular/common/http';
import { ProfileService } from './profile.service';
import { of } from 'rxjs';
describe('ProfileService', () => {
  beforeEach(async () => TestBed.configureTestingModule({
    providers: [ProfileService],
    imports: [HttpClientTestingModule]
  }));
  let service;
  let http;
  let backend;
  beforeEach(inject([ProfileService, HttpClient, HttpTestingController], (_s: ProfileService, _h: HttpClient,
    _b: HttpTestingController) => {
    service = _s;
    http = _h;
    backend = _b;

  }));
  afterEach(inject([HttpTestingController], (httpMock: HttpTestingController) => {
    httpMock.verify();
  }));
it('should update profile', () => {
    let service: ProfileService = TestBed.get(ProfileService);
    let httpTestingController = TestBed.get(HttpTestingController);
    let mockProfile = {
      "Nom": "Eric1",
      "Nom_entreprise": "entreprise",
      "Prenom": "BEN ARBIAA",
      "email": "eric@gmail.com",
      "tel_fixe": "777777778",
      "tel_port": "999999999781118"
    }
    service.updateProfile(mockProfile).subscribe(data => {
      expect(data.Nom).toEqual("Eric1");
    });
    const req = httpTestingController.expectOne('http://localhost:3000/api/profile/');
    expect(req.request.method).toBe('PUT');
    req.flush( mockProfile);
  });
});
});