class_docstr: OSS Filesystem Tests
code: def test_read(self):
      file_path = file_io.join(self._base_dir, "temp_file")
      with gfile.Open(file_path, mode="r+") as f:
          f.write("testing1\ntesting2\ntesting3\n\ntesting5")
      self.assertEqual(36, f.size())
      self.assertEqual("testing1\n", f.read(9))
      self.assertEqual("testing2\n", f.read(9))
      self.assertEqual("t", f.read(1))
      self.assertEqual("esting3\n\ntesting5", f.read())
  
imports: import os
  import unittest
  from tensorflow.python.framework import errors
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.platform import test
  from tensorflow.python.platform import gfile
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 33 for calling the OSSFSTest obj's underlying member method code with example usage: obj.test_read() without return types