code: def test_frame_getitem_toplevel(
      multiindex_dataframe_random_data, indexer, expected_slice
  ):
      df = multiindex_dataframe_random_data.T
      expected = df.reindex(columns=df.columns[expected_slice])
      expected.columns = expected.columns.droplevel(0)
      result = indexer(df)
      tm.assert_frame_equal(result, expected)
  
imports: import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
  from pandas.core.indexing import IndexingError
label_desc: Use image node_id 11 for calling a global function with example usage: test_frame_getitem_toplevel(multiindex_dataframe_random_data, indexer, expected_slice) without return types