anchor.diff:  -export([all/0,
            init/0, init_per_testcase/1, init_per_round/2,
            quit/0, quit_per_testcase/1, quit_per_round/2]).
  --export([zadd/1, zadd_one/1, zcard/1, zcount_n/1, zcount_m/1]).
  +-export([zadd/1, zadd_one/1, zcard/1, zcount_n/1, zcount_m/1, zincrby/1]).
   
   %% ====================================================================
   %% External functions
  
positive.code: -spec init_per_round(atom(), [binary()]) -> ok.
  init_per_round(Fun, Keys) when Fun =:= zcard;
                                 Fun =:= zadd_one;
                                 Fun =:= zcount_n ->
    zadd(Keys),
    ok;
  init_per_round(Fun, _Keys) when Fun =:= zcount_m ->
  
negative.code:     edis_db:process(0),
      #edis_command{cmd = <<"ZADD">>,
                    args = [?KEY, [{1.0 * I, <<"x">>} || I <- lists:seq(1, 10000)]],
                    group = zsets, result_type = number}),
    ok;
  init_per_round(_Fun, _Keys) ->
    _ = edis_db:run(
  