@Test
public void testRetractElements() throws Exception {

  s3.deleteObject(BUCKET_NAME,
          "channelId/efd6e4df-63b6-49af-be5f-15f598778877/presenter-delivery/video-presenter-delivery.mp4");
  EasyMock.expectLastCall().once();
  EasyMock.replay(s3);
  Set<String> mpeIds = new LinkedHashSet<String>();
  mpeIds.add("presenter-delivery-distributed");
  service.retractElements("channelId", distributedMp, mpeIds);
  EasyMock.verify(s3);
}