anchor.diff:                                 test_quadruple_join
                                  ]},
        {join_and_leave_tests, [sequence], [
  -                                         test_quadruple_join_single_leave,
  -                                         test_quadruple_join_double_leave,
  -                                         test_quadruple_join_triple_leave,
  -                                         test_quadruple_join_quadruple_leave
  +                                         test_quadruple_join_single_leave%,
  +                                         %%  the following tests can
  +                                         %%  run into timeouts if the
  +                                         %%  majority of replicas of a
  +                                         %%  lease have left
  +                                         %%  %test_quadruple_join_double_leave,
  +                                         %%  %test_quadruple_join_triple_leave,
  +                                         %%  %test_quadruple_join_quadruple_leave
                                            ]}
       ].
   
  
positive.code:     api_vm:add_nodes(1),
      log:log("wait for ring size ~w", [TargetSize]),
      lease_helper:wait_for_ring_size(TargetSize),
      log:log("wait for correct ring"),
      lease_helper:wait_for_correct_ring(),
      log:log("wait for correct leases ~w", [TargetSize]),
      lease_helper:wait_for_correct_leases(TargetSize).
  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  
negative.code: 
  join_leave_test(JoinTargetSize, LeaveTargetSize) ->
      lease_helper:wait_for_ring_size(1),
      log:log("wait for ring to stabilize"),
      util:wait_for(fun admin:check_leases/0, 10000),
      join_until(JoinTargetSize),
      log:log("wait for ring to stabilize after join until"),
      util:wait_for(fun admin:check_leases/0, 10000),
      lease_helper:print_all_active_leases(),
      lease_helper:print_all_passive_leases(),
      leave_until(JoinTargetSize, LeaveTargetSize),
  