Angular Testing Snippets: Services over HTTP

feature.service.spec.ts

import { Injector } from '@angular/core';
import { async, inject, TestBed } from '@angular/core/testing';
import { Http, HttpModule, Request, RequestMethod, RequestOptions, Response,
  ResponseOptions, URLSearchParams, XHRBackend } from '@angular/http';
import { MockBackend, MockConnection } from '@angular/http/testing';

describe('FeatureService', () => {
  let backend: MockBackend;

  //setup
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [ HttpModule ],
      providers: [
        { provide: MockBackend, useClass: MockBackend },
        { provide: XHRBackend, useExisting: MockBackend },
        FeatureService
      ]
    });
    backend = TestBed.get(MockBackend);

    spyOn(Http.prototype, 'request').and.callThrough();
  });

  afterEach(() => backend.verifyNoPendingRequests());
 
)};