code: def test_eq(self):
      pser, psser = self.pser, self.psser
      self.assert_eq(pser == pser, psser == psser)
      self.assert_eq(pser == [None, 1, None], psser == [None, 1, None])
  
imports: import pandas
  from pandas.api.types import CategoricalDtype
  import pyspark.pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.pandas.tests.data_type_ops.testing_utils import OpsTestBase
label_desc: Use image node_id 23 for calling the NullOpsTestsMixin obj's underlying member method code with example usage: obj.test_eq() without return types