anchor.diff:      {ok, PPid} = ?pending:start_link(testid()),
       {ok, CPid} = ?progress:start_link(testid(), 1, Valid, [{0, 2}, {1, 2}, {2, 2}], self()),
       ok = ?pending:register(PPid),
  +    ok = ?pending:receiver(CPid, PPid),
       {Time, PPid, SPid, CPid}.
   
   scarcity() -> ?scarcity:lookup_server(testid()).
  
positive.code:      ?_test(drop_none_on_exit_case()),
       ?_test(drop_all_on_exit_case()),
       ?_test(marked_stored_not_dropped_case()),
       ?_test(mark_fetched_noop_case()),
       ?_test(mark_valid_not_stored_case()),
       ?_test(mark_valid_stored_case()),
       ?_test(all_stored_marks_stored_case()),
  
negative.code: 
  
  %% @private
  handle_cast(_, State) ->
      {stop, not_implemented, State}.
  
  
  %% @private
  handle_info({piece, {valid, Index}}, State) ->
      #state{
          pieces_stored=Stored,
          pieces_valid=Valid} = State,
  