code: def test_ls(self):
      base_path = pjoin(self.tmp_path, "ls-test")
      self.hdfs.mkdir(base_path)
  
      dir_path = pjoin(base_path, "a-dir")
      f1_path = pjoin(base_path, "a-file-1")
  
      self.hdfs.mkdir(dir_path)
  
      f = self.hdfs.open(f1_path, "wb")
      f.write(b"a" * 10)
  
      contents = sorted(self.hdfs.ls(base_path, False))
      assert contents == [dir_path, f1_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 13 for calling the HdfsTestCases obj's underlying member method code with example usage: obj.test_ls() without return types