code: def testIsdir(self):
      temp_dir = self.get_temp_dir()
      self.assertTrue(gfile.isdir(temp_dir))
  
imports: import io
  import os
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 3 for calling the GFileTest obj's underlying member method code with example usage: obj.testIsdir() without return types