code: def testExists(self):
      temp_dir = self.get_temp_dir()
      self._CreateDeepDirectoryStructure(temp_dir)
      ckpt_path = posixpath.join(temp_dir, "model.ckpt")
      self.assertTrue(gfile.exists(temp_dir))
      self.assertTrue(gfile.exists(ckpt_path))
  
imports: import posixpath
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import errors
  from tensorboard.compat.tensorflow_stub.io import gfile
  import fsspec
label_desc: Use image node_id 2 for calling the GFileFSSpecTest obj's underlying member method code with example usage: obj.testExists() without return types