anchor.diff:      ServerRef = leo_redundant_manager_api:get_server_id(),
       %% ServerRef = poolboy:checkout('ring_worker_pool'),
       {ok, #redundancies{vnode_id_from = 0,
  +                       vnode_id_to   = VNodeIdTo1,
                          nodes = N0}} = leo_redundant_manager_worker:first(ServerRef, 'leo_ring_cur'),
  +    {ok, #redundancies{vnode_id_from = 0,
  +                       vnode_id_to   = VNodeIdTo2,
  +                       nodes = N0}} = leo_redundant_manager_worker:first(ServerRef, 'leo_ring_prv'),
  +
       {ok, #redundancies{nodes = N1}} = leo_redundant_manager_worker:lookup(
                                           ServerRef, 'leo_ring_cur', 0),
       {ok, #redundancies{nodes = N2}} = leo_redundant_manager_worker:lookup(
  
positive.code:     %% poolboy:checkin('ring_worker_pool', ServerRef),
      ok.
  
  -endif.
  
negative.code:     {ok, #redundancies{nodes = N6}} = leo_redundant_manager_worker:lookup(
                                          ServerRef, 'leo_ring_cur', 340282366920938463463374607431768211456),
      {ok, #redundancies{nodes = N7}} = leo_redundant_manager_worker:last(ServerRef, 'leo_ring_cur'),
  
      Size1 = collect_redundancies(ServerRef, 'leo_ring_cur', 1, VNodeIdTo1 + 1, []),
      Size2 = collect_redundancies(ServerRef, 'leo_ring_prv', 1, VNodeIdTo2 + 1, []),
      ?assertEqual((?DEF_NUMBER_OF_VNODES * 5), Size1),
      ?assertEqual((?DEF_NUMBER_OF_VNODES * 5), Size2),
  
      ?assertEqual(3, length(N0)),
      ?assertEqual(3, length(N1)),
  