export {}

declare global {
  namespace jest {
    interface Matchers<R> {
      toIncludeVideoTrack(): CustomMatcherResult
    }
  }
}

expect.extend({
  toIncludeVideoTrack(received: MediaStream): jest.CustomMatcherResult {
    const videoTracks = received.getTracks().filter((track) => track.kind === 'video')
    const pass: boolean = videoTracks.length > 0
    const message: () => string = () => (pass ? '' : `includes no video track`)
    return {
      message,
      pass,
    }
  },
})