code: def testReadLines(self):
      temp_dir = self.get_temp_dir()
      self._CreateDeepDirectoryStructure(temp_dir)
      ckpt_path = os.path.join(temp_dir, "model.ckpt")
  
      # Note \r\n, which io.read will automatically replace with \n.
      # That substitution desynchronizes character offsets (omitting \r) from
      # the underlying byte offsets (counting \r).  Multibyte characters would
      # similarly cause desynchronization.
      raw_ckpt_lines = (
          ["\r\n"]
          + ["line {}\r\n".format(i) for i in range(10)]
          + [" "]
      )
      expected_ckpt_lines = (  # without \r
          ["\n"] + ["line {}\n".format(i) for i in range(10)] + [" "]
      )
      # Write out newlines as given (i.e., \r\n) regardless of OS, so as to
      # test translation on read.
      with io.open(ckpt_path, "w", newline="") as f:
          data = "".join(raw_ckpt_lines)
          f.write(data)
      with gfile.GFile(ckpt_path, "r") as f:
          f.buff_chunk_size = 4  # Test buffering by reducing chunk size
          read_ckpt_lines = list(f)
          self.assertEqual(expected_ckpt_lines, read_ckpt_lines)
  
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 10 for calling the GFileTest obj's underlying member method code with example usage: obj.testReadLines() without return types