code: def test_multiindex_assignment(self):
      # GH3777 part 2
  
      # mixed dtype
      df = DataFrame(
          np.random.default_rng(2)
          .integers(5, 10, size=9)
          .reshape(3, 3),
          columns=list("abc"),
          index=[[4, 4, 8], [8, 10, 12]],
      )
      df["d"] = np.nan
      arr = np.array([0.0, 1.0])
  
      df.loc[4, "d"] = arr
      tm.assert_series_equal(
          df.loc[4, "d"], Series(arr, index=[8, 10], name="d")
      )
  
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 7 for calling the TestMultiIndexSetItem obj's underlying member method code with example usage: obj.test_multiindex_assignment() without return types