anchor.diff:  -export([init_per_testcase/2]).
   -export([end_per_testcase/2]).
   
  --export([t_get_3/1,
  +-export([t_get_3/1, t_filter_2/1,
            t_fold_3/1,t_map_2/1,t_size_1/1,
            t_with_2/1,t_without_2/1]).
   
  
positive.code:     ?badarg(with,[a,#{}]) = (catch maps:with(a,#{})),
      ok.
  
  
  t_fold_3(Config) when is_list(Config) ->
      Vs = lists:seq(1,200),
  
negative.code:     [{ct_hooks, [ts_install_cth]}].
  
  all() ->
      [t_get_3,t_filter_2,
       t_fold_3,t_map_2,t_size_1,
       t_with_2,t_without_2].
  
  