anchor.diff:  
        {with_causal_labels, [],
         [causal_test]},
  +
  +     {with_causal_send, [],
  +      [default_manager_test]},
  +
   
        {with_tls, [],
         [default_manager_test]},
  
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:      {group, with_ack, []},
  
       {group, with_causal_labels, []},
  
       {group, with_causal_send, []},
  
       {group, with_tls, [parallel]},
  
  