code: def test_from_to_pandas(self):
      data = ["x", "y", "z"]
      pser = pd.Series(data)
      psser = ps.Series(data)
      self.assert_eq(pser, psser._to_pandas())
      self.assert_eq(ps.from_pandas(pser), psser)
  
imports: import unittest
  import numpy
  import pandas
  from pandas.api.types import CategoricalDtype
  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_object_dtypes_available
label_desc: Use image node_id 22 for calling the StringOpsTestsMixin obj's underlying member method code with example usage: obj.test_from_to_pandas() without return types