How to Test Angular2 / TypeScript HTTPService without Mock

import {Injectable} from '@angular/core';
import {Http} from '@angular/http';

@Injectable()
export class HttpService {
  result: any;

  constructor(private http:Http) {
  }

   public postRequest(){
       return this.http.get('http://httpbin.org/get');    
  }
}

Above is my code, here is my Test:

I do not want to mock anything, just test the real http connection.

Edit - New service.spec file:

import {beforeEachProviders, beforeEach, it, describe, expect, inject} from '@angular/core/testing';
import {HttpService} from '../../providers/http-service/http-service';
import {TranslateService} from 'ng2-translate/ng2-translate';
import {Goal} from '../../providers/goal/goal';
import {NavController} from 'ionic-angular';
import {HTTP_PROVIDERS, Http} from '@angular/http';

describe('Http Service Test', () => {

      beforeEachProviders(() => {
        return [
            HTTP_PROVIDERS,
            HttpService
        ];
    });

    it('should return response when subscribed to postRequest',
        inject([HttpService], (httpService: HttpService) => {

            httpService.postRequest().subscribe((res) => {
                expect(res.text()).toBe('hello raja');
            }); 
    }));
});

These are my errors in karma console:

28 06 2016 14:33:32.067:ERROR [Chrome 51.0.2704 (Mac OS X 10.11.4) | Http Service Test | should return response when subscribed to postRequest]: TypeError: Cannot read property 'getCookie' of null
    at CookieXSRFStrategy.configureRequest (http://localhost:9876/absolute/var/folders/vy/18sb1wqs60g734bhr75cw9_r0000gn/T/9b9439f5f9c1590d3052594bcae9e877.browserify?26719cf22e6406ebc638b6b187c777666dcc5698:36568:81)
    at XHRBackend.createConnection (http://localhost:9876/absolute/var/folders/vy/18sb1wqs60g734bhr75cw9_r0000gn/T/9b9439f5f9c1590d3052594bcae9e877.browserify?26719cf22e6406ebc638b6b187c777666dcc5698:36583:28)
    at httpRequest (http://localhost:9876/absolute/var/folders/vy/18sb1wqs60g734bhr75cw9_r0000gn/T/9b9439f5f9c1590d3052594bcae9e877.browserify?26719cf22e6406ebc638b6b187c777666dcc5698:37476:20)