Unit test of service with http client, with Spy,

trainer-calendar.service.spec.ts

/* tslint:disable:no-unused-variable */
let httpClientSpy: { get: jasmine.Spy };
import { TestBed, async, inject } from '@angular/core/testing';
import { TrainerCalendarService } from './trainer-calendar.service';
import { asyncData } from '../helpers/async-observable-helpers';
import { Appointment } from '../models/appointment';

let service: TrainerCalendarService;

describe('Service: TrainerCalendar', () => {
  beforeEach(() => {
    httpClientSpy = jasmine.createSpyObj('HttpClient', ['get', 'post']);
    service = new TrainerCalendarService(<any> httpClientSpy);
  });

  it('should returns list of appointment', () => {
    const list: Appointment[] = [
      new Appointment(),
      new Appointment()
    ];

    httpClientSpy.get.and.returnValue(asyncData<Appointment[]>(list));

    service.getAll().then(items => expect(items).toEqual(list, 'same items'));
  });
});