code: def test_object_missing_values():
      # Check that the presence of missing values doesn't change how object dtype
      # is hashed.
      s = pd.Series(["a", "b", "c", None])
      h1 = hash_pandas_object(s).iloc[:3]
      h2 = hash_pandas_object(s.iloc[:3])
      tm.assert_series_equal(h1, h2)
  
file_path: dask/dask/dataframe/tests/test_hashing.py
imports: from __future__ import annotations
  import numpy
  import pandas
  import pytest
  from pandas.util import hash_pandas_object
  import dask.dataframe
  from dask.dataframe import _compat
  from dask.dataframe._compat import tm
  from dask.dataframe.utils import assert_eq
label_desc: Use image node_id 3 for calling a global function with example usage: test_object_missing_values() without return types