angular 2 testing - DaveService

dave.service.ts

import { Injectable } from '@angular/core';
import { Headers, Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

import { devlog } from '../_helpers/devlog';

@Injectable()
export class DaveService {
  private localAPI = 'http://localhost:3002/?api=1';

  constructor(private http: Http) {}

  daveCheckObservable() {
    devlog('api', 'daveService.daveCheckObservable()')
    return this.http.get(this.localAPI)
      .map((response: Response) => {
        return response.json();
      });
    }
}