anchor.diff:      Response.
   
   %% @doc Fetch document.
  --spec nebula2_riak:fetch(pid(), list()) -> {ok, map()}.
  +-spec fetch(pid(), list()) -> {ok, map()}.
   fetch(Pid, Data) when is_pid(Pid); is_list(Data) ->
       ?nebMsg("Entry"),
       Oid = proplists:get_value(<<"_yz_rk">>, Data),
  
positive.code:     meck:new(riakc_pb_socket, [non_strict]),
      Pid = self(),
      meck:expect(riakc_pb_socket, ping, [Pid], pong),
      ?assertMatch(true, nebula2_riak:available(Pid)),
      meck:expect(riakc_pb_socket, ping, [Pid], pang),
      ?assertMatch(false, nebula2_riak:available(Pid)),
      meck:unload(riakc_pb_socket).
  
  delete_test() ->
  
negative.code:     Result.
  
  %% @doc Update an existing key/value pair.
  -spec update(pid(),
                            object_oid(),      %% Oid
                            map()              %% Data to store
                           ) -> ok | {error, term()}.
  