client/src/app/videos/recommendations/recommended-videos.store.spec.ts

   1 import { RecommendedVideosStore } from '@app/videos/recommendations/recommended-videos.store'
   2 import { RecommendationService } from '@app/videos/recommendations/recommendations.service'
   3
   4 describe('RecommendedVideosStore', () => {
   5   describe('requestNewRecommendations', () => {
   6     let store: RecommendedVideosStore
   7     let service: RecommendationService
   8     beforeEach(() => {
   9       service = {
  10         getRecommendations: jest.fn(() => new Promise((r) => r()))
  11       }
  12       store = new RecommendedVideosStore(service)
  13     })
  14     it('should pull new videos from the service one time when given the same UUID twice', () => {
  15       store.requestNewRecommendations('some-uuid')
  16       store.requestNewRecommendations('some-uuid')
  17       // Requests aren't fulfilled until someone asks for them (ie: subscribes)
  18       store.recommendations$.subscribe()
  19       expect(service.getRecommendations).toHaveBeenCalledTimes(1)
  20     })
  21   })
  22 })