anchor.diff:      Out = {'pandas.core.frame.DataFrame', [<<"age">>],
           [[29], [29], [30], [40], [40], [30]]},
       ?assertEqual(Out, Erl).
  +
  +test_jun_pandas_single_selection([{jun_worker, Pid}, {path, Path}, _]) ->
  +    {ok, {?DATAFRAME, DataFrame}} = jun_pandas:read_csv(Pid, Path, []),
  +    {ok, Series} = jun_pandas:single_selection(Pid, DataFrame, 'age', []),
  +    ?assertMatch({?SERIES, _}, Series).
  
positive.code:     test_jun_pandas_len_index/1,
      test_jun_pandas_memory_usage/1,
      test_jun_pandas_info_columns/1,
      test_jun_pandas_selection/1]).
  
  all() ->
      [test_jun_pandas_columns,
  
negative.code: -include_lib("eunit/include/eunit.hrl").
  
  -define(DATAFRAME, 'pandas.core.frame.DataFrame').
  -define(SERIES, 'pandas.core.frame.Series').
  
  -export([all/0, init_per_testcase/2, end_per_testcase/2]).
  -export([test_jun_pandas_columns/1,
  