client/src/app/videos/recommendations/recent-videos-recommendation.service.spec.ts

   1 import { RecentVideosRecommendationService } from '@app/videos/recommendations/recent-videos-recommendation.service'
   2 import { VideosProvider } from '@app/shared/video/video.service'
   3 import { EMPTY, of } from 'rxjs'
   4 import Mock = jest.Mock
   5
   6 describe('"Recent Videos" Recommender', () => {
   7   describe('getRecommendations', () => {
   8     let videosService: VideosProvider
   9     let service: RecentVideosRecommendationService
  10     let getVideosMock: Mock<any>
  11     beforeEach(() => {
  12       getVideosMock = jest.fn(() => EMPTY)
  13       videosService = {
  14         getVideos: getVideosMock
  15       }
  16       service = new RecentVideosRecommendationService(videosService)
  17     })
  18     it('should filter out the given UUID from the results', async (done) => {
  19       const vids = [
  20         { uuid: 'uuid1' },
  21         { uuid: 'uuid2' }
  22       ]
  23       getVideosMock.mockReturnValueOnce(of({ videos: vids }))
  24       const result = await service.getRecommendations('uuid1').toPromise()
  25       const uuids = result.map(v => v.uuid)
  26       expect(uuids).toEqual(['uuid2'])
  27       done()
  28     })
  29     it('should return 5 results when the given UUID is NOT in the first 5 results', async (done) => {
  30       const vids = [
  31         { uuid: 'uuid2' },
  32         { uuid: 'uuid3' },
  33         { uuid: 'uuid4' },
  34         { uuid: 'uuid5' },
  35         { uuid: 'uuid6' },
  36         { uuid: 'uuid7' }
  37       ]
  38       getVideosMock.mockReturnValueOnce(of({ videos: vids }))
  39       const result = await service.getRecommendations('uuid1').toPromise()
  40       expect(result.length).toEqual(5)
  41       done()
  42     })
  43     it('should return 5 results when the given UUID IS PRESENT in the first 5 results', async (done) => {
  44       const vids = [
  45         { uuid: 'uuid1' },
  46         { uuid: 'uuid2' },
  47         { uuid: 'uuid3' },
  48         { uuid: 'uuid4' },
  49         { uuid: 'uuid5' },
  50         { uuid: 'uuid6' }
  51       ]
  52       getVideosMock
  53         .mockReturnValueOnce(of({ videos: vids }))
  54       const result = await service.getRecommendations('uuid1').toPromise()
  55       expect(result.length).toEqual(5)
  56       done()
  57     })
  58     it('should fetch an extra result in case the given UUID is in the list', async (done) => {
  59       await service.getRecommendations('uuid1').toPromise()
  60       let expectedSize = service.pageSize + 1
  61       let params = { currentPage: jasmine.anything(), itemsPerPage: expectedSize }
  62       expect(getVideosMock).toHaveBeenCalledWith(params, jasmine.anything())
  63       done()
  64     })
  65   })
  66 })