import { RecentVideosRecommendationService } from '@app/videos/recommendations/recent-videos-recommendation.service'
import { VideosProvider } from '@app/shared/video/video.service'
import { EMPTY, of } from 'rxjs'
import Mock = jest.Mock
describe('"Recent Videos" Recommender', () => {
describe('getRecommendations', () => {
let videosService: VideosProvider
let service: RecentVideosRecommendationService
let getVideosMock: Mock<any>
beforeEach(() => {
getVideosMock = jest.fn(() => EMPTY)
videosService = {
getVideos: getVideosMock
}
service = new RecentVideosRecommendationService(videosService)
})
it('should filter out the given UUID from the results', async (done) => {
const vids = [
{ uuid: 'uuid1' },
{ uuid: 'uuid2' }
]
getVideosMock.mockReturnValueOnce(of({ videos: vids }))
const result = await service.getRecommendations({ uuid: 'uuid1' }).toPromise()
const uuids = result.map(v => v.uuid)
expect(uuids).toEqual(['uuid2'])
done()
})
it('should return 5 results when the given UUID is NOT in the first 5 results', async (done) => {
const vids = [
{ uuid: 'uuid2' },
{ uuid: 'uuid3' },
{ uuid: 'uuid4' },
{ uuid: 'uuid5' },
{ uuid: 'uuid6' },
{ uuid: 'uuid7' }
]
getVideosMock.mockReturnValueOnce(of({ videos: vids }))
const result = await service.getRecommendations({ uuid: 'uuid1' }).toPromise()
expect(result.length).toEqual(5)
done()
})
it('should return 5 results when the given UUID IS PRESENT in the first 5 results', async (done) => {
const vids = [
{ uuid: 'uuid1' },
{ uuid: 'uuid2' },
{ uuid: 'uuid3' },
{ uuid: 'uuid4' },
{ uuid: 'uuid5' },
{ uuid: 'uuid6' }
]
getVideosMock
.mockReturnValueOnce(of({ videos: vids }))
const result = await service.getRecommendations({ uuid: 'uuid1' }).toPromise()
expect(result.length).toEqual(5)
done()
})
it('should fetch an extra result in case the given UUID is in the list', async (done) => {
await service.getRecommendations({ uuid: 'uuid1' }).toPromise()
let expectedSize = service.pageSize + 1
let params = { currentPage: jasmine.anything(), itemsPerPage: expectedSize }
expect(getVideosMock).toHaveBeenCalledWith(params, jasmine.anything())
done()
})
})
})
