code: def testReadWithOffset(self):
      ckpt_content = "asdfasdfasdffoobarbuzz"
      ckpt_b_content = b"asdfasdfasdffoobarbuzz"
      temp_dir = self._CreateDeepS3Structure(ckpt_content=ckpt_content)
      ckpt_path = self._PathJoin(temp_dir, "model.ckpt")
      with gfile.GFile(ckpt_path, "r") as f:
          f.buff_chunk_size = 4  # Test buffering by reducing chunk size
          ckpt_read = f.read(12)
          self.assertEqual("asdfasdfasdf", ckpt_read)
          ckpt_read = f.read(6)
          self.assertEqual("foobar", ckpt_read)
          ckpt_read = f.read(1)
          self.assertEqual("b", ckpt_read)
          ckpt_read = f.read()
          self.assertEqual("uzz", ckpt_read)
          ckpt_read = f.read(1000)
          self.assertEqual("", ckpt_read)
      with gfile.GFile(ckpt_path, "rb") as f:
          ckpt_read = f.read()
          self.assertEqual(ckpt_b_content, ckpt_read)
  
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 11 for calling the GFileTest obj's underlying member method code with example usage: obj.testReadWithOffset() without return types