import { TestBed, inject } from '@angular/core/testing';
import { HttpModule, Http, BaseRequestOptions, XHRBackend, Response, ResponseOptions } from '@angular/http';
import { HttpClient, HttpClientModule } from '@angular/common/http';
import { UsersService } from './users.service';
import { MockBackend } from '@angular/http/testing';

describe('UsersService', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpModule, HttpClientModule],
      providers: [
        UsersService,
        {provide: XHRBackend, useClass: MockBackend}
      ]});
  });

  const mockResponseGetUsers = {
    data : [
      { id: 0, firstName: 'firstName0', lastName: 'lastName0', email: 'email0@gmail.com', groups: [] },
      { id: 1, firstName: 'firstName1', lastName: 'lastName1', email: 'email1@gmail.com', groups: [] },
      { id: 2, firstName: 'firstName2', lastName: 'lastName2', email: 'email2@gmail.com', groups: [] },
      { id: 3, firstName: 'firstName3', lastName: 'lastName3', email: 'email3@gmail.com', groups: [] },
    ]
  }

  it('should return an Observable<User[]>',
    inject([UsersService, XHRBackend], (usersService, mockBackend) => {

      mockBackend.connections.subscribe((connection) => {
        connection.mockRespond(new Response(new ResponseOptions({
          body: JSON.stringify(mockResponseGetUsers)
        })));
      });

    usersService.getUsers().subscribe((users) => {
      expect(users.length).toBe(4);
      expect(users[0].firstName).toEqual('firstName0');
      expect(users[1].firstName).toEqual('firstName1');
      expect(users[2].firstName).toEqual('firstName2');
      expect(users[3].firstName).toEqual('firstName3');
    });
  }));

  it('should be created', inject([UsersService], (service: UsersService) => {
    expect(service).toBeTruthy();
  }));
});