Using Parse.com API, how to save and retrieve an object in offline mode?

parse_test.mm

- testOffline {
  // Important! do all methods without Network
  PFObject *todo1 = [PFObject objectWithClassName:@"Todo"];
  [todo1 setObject:@"Learn Parse API" forKey:@"text"];
  [todo1 saveEventually];

  PFObject *todo2 = [PFObject objectWithClassName:@"Todo"];
  [todo2 setObject:@"Implement iOS" forKey:@"text"];
  [todo2 saveEventually];

  PFObject *todo3 = [PFObject objectWithClassName:@"Todo"];
  [todo3 setObject:@"Implement Android" forKey:@"text"];
  [todo3 saveEventually];
}

- testOfflineSometimeLaterButStillOffline {
  // still offline
  PFQuery *query = [PFQuery queryWithClassName:@"Todo"];
  query.cachePolicy = kPFCachePolicyCacheElseNetwork;

  NSArray * results = [query findObjects];
  NSLog(@"Why are results empty? results => %@", results);
}