code: def test_frame_setitem_multi_column(self):
      df = DataFrame(
          np.random.default_rng(2).standard_normal((10, 4)),
          columns=[["a", "a", "b", "b"], [0, 1, 0, 1]],
      )
  
      cp = df.copy()
      cp["a"] = cp["b"]
      tm.assert_frame_equal(cp["a"], cp["b"])
  
      # set with ndarray
      cp = df.copy()
      cp["a"] = cp["b"].values
      tm.assert_frame_equal(cp["a"], cp["b"])
  
imports: import numpy
  import pytest
  from pandas.errors import SettingWithCopyError
  import pandas
  from pandas import DataFrame, MultiIndex, Series, date_range, isna, notna
  import pandas._testing
label_desc: Use image node_id 13 for calling the TestMultiIndexSetItem obj's underlying member method code with example usage: obj.test_frame_setitem_multi_column() without return types