code: def setUp(self) -> None:
      super().setUp()
      # NOTE: parallelism == 1 is required to keep the order of results
      self.env.set_parallelism(1)
      self.avro_dir_name = tempfile.mkdtemp(dir=self.tempdir)
  
imports: import glob
  import os
  import tempfile
  from typing import Tuple, List
  from avro.datafile import DataFileReader
  from avro.io import DatumReader
  from py4j.java_gateway import JavaObject, java_import
  from pyflink.datastream import MapFunction
  from pyflink.datastream.connectors.file_system import FileSink
  from pyflink.datastream.formats.avro import AvroSchema, GenericRecordAvroTypeInfo, AvroBulkWriters, AvroInputFormat
  from pyflink.datastream.tests.test_util import DataStreamTestSinkFunction
  from pyflink.java_gateway import get_gateway
  from pyflink.testing.test_case_utils import PyFlinkUTTestCase
label_desc: Use image node_id 1 for calling the FileSinkAvroWritersTests obj's underlying member method code with example usage: obj.setUp() without return types