code: def test_setitem_nonmonotonic(self):
      # https://github.com/pandas-dev/pandas/issues/31449
      index = MultiIndex.from_tuples(
          [("a", "c"), ("b", "x"), ("a", "d")], names=["l1", "l2"]
      )
      df = DataFrame(data=[0, 1, 2], index=index, columns=["e"])
      df.loc["a", "e"] = np.arange(99, 101, dtype="int64")
      expected = DataFrame({"e": [99, 1, 100]}, index=index)
      tm.assert_frame_equal(df, expected)
  
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 21 for calling the TestMultiIndexSetItem obj's underlying member method code with example usage: obj.test_setitem_nonmonotonic() without return types