@Test
 public void findOneEntityWithOnlyHashKey() {
   User user = repoForEntityWithOnlyHashKey.findOne(1l);
   Mockito.verify(dynamoDBOperations).load(User.class, 1l);
   assertEquals(testUser, user);
 }
 @Test
 public void findOneEntityWithHashAndRangeKey() {
   Playlist playlist = repoForEntityWithHashAndRangeKey.findOne(testPlaylistId);
   assertEquals(testPlaylist, playlist);
 }