angular 2 testing - HomeComponent

home.component.ts

import { Component, OnInit, OnDestroy } from '@angular/core';
import { Response } from '@angular/http';
import { Subscription } from 'rxjs/Subscription';

import { DaveService } from '../_services/dave.service';
import { devlog } from '../_helpers/devlog';

@Component({
  moduleId: module.id,
  templateUrl: './home.component.html',
  styleUrls: [ './home.component.css' ]
})

export class HomeComponent implements OnInit, OnDestroy {
  private dave: any;
  private daveSub: Subscription;

  constructor(
    private daveService:DaveService,
  ) { }

  ngOnInit() {
    this.daveCheckSubscribeObservable();
  }

  ngOnDestroy() {
    this.daveSub.unsubscribe();
  }

  private daveCheckSubscribeObservable() {
    this.daveSub = this.daveService.daveCheckObservable().subscribe(
      (daveData: any) => console.log('this.dave post-Obs-call', daveData),
      (error) => console.log(error),
      () => console.log('daveCheckObservable Completed!')
    );
  }

  private daveCheckObservable() {
    devlog('api', 'calling daveService.daveCheckObservable()')
    this.dave = this.daveService.daveCheckObservable();
  }
}