code: def test_set_index_multiindexcolumns(self):
      columns = MultiIndex.from_tuples(
          [("foo", 1), ("foo", 2), ("bar", 1)]
      )
      df = DataFrame(
          np.random.default_rng(2).standard_normal((3, 3)),
          columns=columns,
      )
  
      result = df.set_index(df.columns[0])
  
      expected = df.iloc[:, 1:]
      expected.index = df.iloc[:, 0].values
      expected.index.names = [df.columns[0]]
      tm.assert_frame_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import Categorical, CategoricalIndex, DataFrame, DatetimeIndex, Index, MultiIndex, Series, date_range, period_range, to_datetime
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestSetIndex obj's underlying member method code with example usage: obj.test_set_index_multiindexcolumns() without return types