anchor.diff:      %% retrieve
       undefined = syn:find_by_key(<<"my proc">>),
       undefined = rpc:call(SlaveNodeName, syn, find_by_key, [<<"my proc">>]).
  -
  -two_nodes_when_mnesia_is_disc_find_by_pid(Config) ->
  -    %% get slave
  -    SlaveNodeName = proplists:get_value(slave_node_name, Config),
  -    %% set schema location
  -    application:set_env(mnesia, schema_location, disc),
  -    rpc:call(SlaveNodeName, mnesia, schema_location, [disc]),
  -    %% create schema
  -    mnesia:create_schema([node(), SlaveNodeName]),
  -    %% start
  -    ok = syn:start(),
  -    ok = rpc:call(SlaveNodeName, syn, start, []),
  -    timer:sleep(100),
  -    %% start process
  -    Pid = syn_test_suite_helper:start_process(),
  -    %% register
  -    ok = syn:register(<<"my proc">>, Pid),
  -    %% retrieve
  -    <<"my proc">> = syn:find_by_pid(Pid),
  -    <<"my proc">> = rpc:call(SlaveNodeName, syn, find_by_pid, [Pid]),
  -    %% kill process
  -    syn_test_suite_helper:kill_process(Pid),
  -    timer:sleep(100),
  -    %% retrieve
  -    undefined = syn:find_by_pid(Pid),
  -    undefined = rpc:call(SlaveNodeName, syn, find_by_pid, [Pid]).
   
   two_nodes_when_mnesia_is_ram_process_count(Config) ->
       %% get slave
  
positive.code:             single_node_when_mnesia_is_ram_find_by_pid,
              single_node_when_mnesia_is_ram_re_register_error,
              single_node_when_mnesia_is_ram_unregister,
              single_node_when_mnesia_is_disc_find_by_key,
              single_node_when_mnesia_is_ram_process_count
          ]},
          {two_nodes_process_registration, [shuffle], [
              two_nodes_when_mnesia_is_ram_find_by_key,
              two_nodes_when_mnesia_is_disc_find_by_pid,
              two_nodes_when_mnesia_is_ram_process_count
          ]}
      ].
  %% -------------------------------------------------------------------
  
negative.code:     %% kill process
      syn_test_suite_helper:kill_process(Pid).
  
  single_node_when_mnesia_is_ram_process_count(_Config) ->
      %% set schema location
      application:set_env(mnesia, schema_location, ram),
  