code: def test_hadoop_is_dir(self):
      self.assertTrue(hl.hadoop_is_dir(resource("ls_test")))
      self.assertTrue(hl.hadoop_is_dir(resource("ls_test/subdir")))
      self.assertFalse(hl.hadoop_is_dir(resource("ls_test/f_50")))
      self.assertFalse(
          hl.hadoop_is_dir(resource("ls_test/invalid-path"))
      )
  
imports: import json
  import unittest
  import hail
  from hail.utils import *
  from hail.utils.misc import escape_str, escape_id
  from hail.utils.java import FatalError
  from hail.utils.linkedlist import LinkedList
  from ..helpers import *
label_desc: Use image node_id 7 for calling the Tests obj's underlying member method code with example usage: obj.test_hadoop_is_dir() without return types