wordbank.service.spec.ts

import { TestBed, inject, fakeAsync, tick } from '@angular/core/testing'

import { WordbankService } from './wordbank.service'
import { HttpClient, HttpClientModule } from '@angular/common/http'
import {
  HttpTestingController,
  HttpClientTestingModule,
} from '@angular/common/http/testing'
import { Observable } from 'rxjs/Observable'
import { of } from 'rxjs/observable/of'

let service
// let controllerService
let httpMock

describe('WordbankService', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientModule, HttpClientTestingModule],
      providers: [WordbankService],
    })

    service = TestBed.get(WordbankService)
    // controllerService = TestBed.get(ControllerService)
    httpMock = TestBed.get(HttpTestingController)
  })

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

  fit(`should check server if fragment is valid`, (done: DoneFn) => {
    const frag = 'delt'

    const spyCheckIfValid = spyOn(
      service,
      'checkIfValidFragment'
    ).and.callThrough()

    const spyCacheResult = spyOn(service, 'cacheResult').and.callThrough()

    const fakeResponse: Observable<boolean> = of(true)

    service.checkIfValidFragment(frag).subscribe(res => {
      console.log('res is', res)
      expect(res.value).toBe(true)
      done()
    })

    const req = httpMock.expectOne({ method: 'GET' })
    const regex: any = new RegExp('isvalid/' + frag + '$')

    expect(req.request.url).toMatch(regex)

    req.flush(fakeResponse)

    expect(spyCacheResult.calls.count()).toBe(1, 'calls to cacheResult')
    expect(spyCheckIfValid.calls.count()).toBe(
      1,
      'calls to checkIfValidFragment'
    )
  })
})