code: def test_open_write_error(self):
      with pytest.raises((FileExistsError, IsADirectoryError)):
          self.hdfs.open("/", "wb")
  
imports: import os
  import random
  from io import BytesIO
  from os.path import join
  import numpy
  import pytest
  import pyarrow
  from pyarrow.tests import util
  from pyarrow.tests.parquet.common import _test_dataframe
  from pyarrow.tests.parquet.test_dataset import _test_write_to_dataset_with_partitions, _test_write_to_dataset_no_partitions
  from pyarrow.util import guid
label_desc: Use image node_id 18 for calling the HdfsTestCases obj's underlying member method code with example usage: obj.test_open_write_error() without return types