anchor.diff:       {group, with_ack, []},
   
        {group, with_causal_labels, []},
  +
  +     {group, with_causal_send, []},
   
        {group, with_tls, [parallel]},
   
  
positive.code: init_per_group(with_no_channels, Config) ->
      [{parallelism, 1}, {channels, []}] ++ Config;
  init_per_group(with_causal_labels, Config) ->
      [{causal_labels, [vnode]}] ++ Config;
  init_per_group(with_ack, Config) ->
      [{forward_options, [{ack, true}]}] ++ Config;
  init_per_group(with_tls, Config) ->
  
negative.code: 
       {with_causal_labels, [],
        [causal_test]},
  
       {with_causal_send, [],
        [default_manager_test]},
  
  
       {with_tls, [],
        [default_manager_test]},
  