anchor.diff:              unittest_helper:make_ring(1, [{config, [
                               {log_path, PrivDir}
                               , EnableClustering
  +                            , ClusterRadius
                           ]}]),
               timer:sleep(500);
           two_nodes ->
  
positive.code:     Config2.
  
  init_per_testcase(Testcase, Config) ->
      % dc_clustering must be activated
      EnableClustering = {dc_clustering_enable, true},
      case Testcase of
          single_node ->
              unittest_helper:stop_ring(),
  
negative.code:             unittest_helper:make_ring(2, [{config, [
                              {log_path, PrivDir}
                              , EnableClustering
                              , ClusterRadius
                          ]}]),
              timer:sleep(500);
          _Else -> ok
  