code: def testStat(self):
      ckpt_content = "asdfasdfasdffoobarbuzz"
      temp_dir = self._CreateDeepS3Structure(ckpt_content=ckpt_content)
      ckpt_path = self._PathJoin(temp_dir, "model.ckpt")
      ckpt_stat = gfile.stat(ckpt_path)
      self.assertEqual(ckpt_stat.length, len(ckpt_content))
      bad_ckpt_path = self._PathJoin(temp_dir, "bad_model.ckpt")
      with self.assertRaises(errors.NotFoundError):
          gfile.stat(bad_ckpt_path)
  
imports: import boto3
  import os
  import unittest
  from moto import mock_s3
  from tensorboard.compat.tensorflow_stub import errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 8 for calling the GFileTest obj's underlying member method code with example usage: obj.testStat() without return types