anchor.diff:                                             [#edis_command{cmd = <<"APPEND">>,
                                                             args = [<<"test-string">>, <<"X">>],
                                                             result_type = number,
  -                                                          group = strings} || _Key <- Keys]
  -                            ]}),
  +                                                          group = strings} || _Key <- Keys]]}),
     case Deleted of
       0 -> ok;
       1 -> ok
  
positive.code: quit_per_testcase(_Function) -> ok.
  
  -spec init_per_round(atom(), [binary()]) -> ok.
  init_per_round(append, Keys) ->
    [{ok, Deleted} | OkKeys] =
      edis_db:run(
        edis_db:process(0),
  
negative.code:     #edis_command{cmd = <<"APPEND">>, args = [<<"test-string">>, Key],
                    group = strings, result_type = number}).
  
  -spec decr([binary()]) -> integer().
  decr(_) ->
    edis_db:run(
      edis_db:process(0),
      #edis_command{cmd = <<"DECR">>, args = [<<"test-string">>],
                    group = strings, result_type = number}).
  
  -spec decrby([binary()]) -> integer().
  decrby(Keys) ->
    edis_db:run(
      edis_db:process(0),
      #edis_command{cmd = <<"DECRBY">>, args = [<<"test-string">>, length(Keys)],
                    group = strings, result_type = number}).
  
  -spec get([binary()]) -> binary().
  get(_) ->
    edis_db:run(
      edis_db:process(0),
      #edis_command{cmd = <<"GET">>, args = [<<"test-string">>],
                    group = strings, result_type = bulk}).
  