code: def test_multiindex(multiindex):
      """
      Test output for a MultiIndex and tuple passed.
      """
      assert_frame_equal(
          multiindex.select_columns(("bar", "one")),
          multiindex.loc[:, [("bar", "one")]],
      )
  
imports: import datetime
  import re
  from itertools import product
  import numpy
  import pandas
  import pytest
  from pandas.api.types import is_numeric_dtype
  from pandas.testing import assert_frame_equal
  from janitor.functions.utils import DropLabel, get_columns, patterns
label_desc: Use image node_id 9 for calling a global function with example usage: test_multiindex(multiindex) without return types