code: def test_set_column_scalar_with_loc(
      self,
      multiindex_dataframe_random_data,
      using_copy_on_write,
      warn_copy_on_write,
  ):
      frame = multiindex_dataframe_random_data
      subset = frame.index[[1, 4, 5]]
  
      frame.loc[subset] = 99
      assert (frame.loc[subset].values == 99).all()
  
      frame_original = frame.copy()
      col = frame["B"]
      with tm.assert_cow_warning(warn_copy_on_write):
          col[subset] = 97
      if using_copy_on_write:
          # chained setitem doesn't work with CoW
          tm.assert_frame_equal(frame, frame_original)
      else:
          assert (frame.loc[subset, "B"] == 97).all()
  
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 18 for calling the TestMultiIndexSetItem obj's underlying member method code with example usage: obj.test_set_column_scalar_with_loc(multiindex_dataframe_random_data, using_copy_on_write, warn_copy_on_write) without return types