anchor.diff:  delete_group_from_handle(HID, UID, {RestAddress, Headers, Options}) ->
       Address = <<(list_to_binary(RestAddress))/binary, "/handles/", HID/binary, "/groups/", UID/binary>>,
       Response = do_request(Address, Headers, delete, <<>>, Options),
  -    get_body_map(Response).
  +    get_response_status(Response).
   
   get_user_privileges_for_handle(HID, UID, {RestAddress, Headers, Options}) ->
       Address = <<(list_to_binary(RestAddress))/binary, "/handles/", HID/binary, "/users/", UID/binary, "/privileges">>,
  
positive.code: delete_user_from_handle(HID, UID, {RestAddress, Headers, Options}) ->
      Address = <<(list_to_binary(RestAddress))/binary, "/handles/", HID/binary, "/users/", UID/binary>>,
      Response = do_request(Address, Headers, delete, <<>>, Options),
      get_body_map(Response).
  
  add_group_to_handle(HID, UID, {RestAddress, Headers, Options}) ->
      Address = <<(list_to_binary(RestAddress))/binary, "/handles/", HID/binary, "/groups/", UID/binary>>,
      Response = do_request(Address, Headers, put, <<>>, Options),
      get_body_map(Response).
  
  list_groups_of_handle(HID, {RestAddress, Headers, Options}) ->
      Address = <<(list_to_binary(RestAddress))/binary, "/handles/", HID/binary, "/groups/">>,
  
negative.code: 
  % handles_rest_module_test_group
  -export([
      create_doi_handle_test/1,
      create_pid_handle_test/1,
      list_handles_test/1,
      get_handle_test/1,
      modify_handle_test/1,
  