code: def test_exists_isdir_isfile(self):
      dir_path = pjoin(self.tmp_path, "info-base")
      file_path = pjoin(dir_path, "ex")
      missing_path = pjoin(dir_path, "this-path-is-missing")
  
      self.hdfs.mkdir(dir_path)
      with self.hdfs.open(file_path, "wb") as f:
          f.write(b"foobarbaz")
  
      assert self.hdfs.exists(dir_path)
      assert self.hdfs.exists(file_path)
      assert not self.hdfs.exists(missing_path)
  
      assert self.hdfs.isdir(dir_path)
      assert not self.hdfs.isdir(file_path)
      assert not self.hdfs.isdir(missing_path)
  
      assert not self.hdfs.isfile(dir_path)
      assert self.hdfs.isfile(file_path)
      assert not self.hdfs.isfile(missing_path)
  
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 11 for calling the HdfsTestCases obj's underlying member method code with example usage: obj.test_exists_isdir_isfile() without return types