anchor.diff:      receive after 50 -> ok end,
       ?assertNot(is_process_alive(NodePid2)).
   
  -message_being_sent_around_the_ring_test() ->
  +send_message_around_the_ring_test() ->
       Message = initial_message,
       N = 3,
       Nodes = start(N, Message),
  
positive.code:     ?assertMatch({Message, SendNode} when SendNode == FirstNode, ReplyFromSecondNode),
      ?assertMatch({Message, SendNode} when SendNode == SecondNode, ReplyFromLastNode).
  
  terminate_gracefully_when_ring_nodes_receive_a_quit_message_test() ->
      Message = initial_message,
      N = 3,
      Nodes = start(N, Message),
  
negative.code:     Reply = fetch_message(NodePid2),
      ?assertEqual({Message, NodePid}, Reply).
  
  when_node_receive_quit_message_then_the_node_terminate_test() ->
      NodePid = spawn_node(),
      NodePid2 = spawn_node(),
  
  