code: def test_pickling_file_handles(self):
      # to be corrected with SPARK-11160
      try:
          import xmlrunner  # noqa: F401
      except ImportError:
          ser = CloudPickleSerializer()
          out1 = sys.stderr
          out2 = ser.loads(ser.dumps(out1))
          self.assertEqual(out1, out2)
  
imports: import math
  import sys
  import unittest
  from pyspark import serializers
  from pyspark.serializers import CloudPickleSerializer, CompressedSerializer, AutoBatchedSerializer, BatchedSerializer, AutoSerializer, NoOpSerializer, PairDeserializer, FlattenedValuesSerializer, CartesianDeserializer, CPickleSerializer, UTF8Deserializer, MarshalSerializer
  from pyspark.testing.utils import PySparkTestCase, read_int, write_int, ByteArrayOutput, have_numpy, have_scipy
label_desc: Use image node_id 5 for calling the SerializationTestCase obj's underlying member method code with example usage: obj.test_pickling_file_handles() without return types