code: def test_from_to_pandas(self):
      for pser, psser in self.intergral_extension_pser_psser_pairs:
          self.check_extension(pser, psser._to_pandas())
          self.check_extension(ps.from_pandas(pser), psser)
  
imports: import unittest
  import pandas
  import numpy
  from pyspark import pandas
  from pyspark.pandas.config import option_context
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.pandas.tests.data_type_ops.testing_utils import OpsTestBase
  from pyspark.pandas.typedef.typehints import extension_dtypes_available, extension_float_dtypes_available, extension_object_dtypes_available
  from pyspark.sql.types import DecimalType, IntegralType
label_desc: Use image node_id 4 for calling the IntegralExtensionOpsTest obj's underlying member method code with example usage: obj.test_from_to_pandas() without return types