anchor.diff:  -define(TIMEOUT, 10000).
   -define(CLIENT_NUMBER, 3).
   -define(HIGH_CLIENT_NUMBER, 10).
  +-define(PAUSE_FOR_CLUSTERING, timer:sleep(5000)).
   
   %% ==================================================================
   %% common_test callbacks
  
positive.code:                    {servers, Servers},
                     {clients, Clients}]),
  
      %% Pause for clustering.
      timer:sleep(1000),
  
      %% Test on_down callback.
      [{_, _}, {_, _}, {_, Node3}, {_, Node4}] = Nodes,
  
negative.code:                    {servers, Servers},
                     {clients, Clients}]),
  
      ?PAUSE_FOR_CLUSTERING,
  
      %% Test on_down callback.
      [{_, _}, {_, _}, {_, Node3}, {_, Node4}] = Nodes,
  