class_docstr: OSS Filesystem Tests
code: def setUp(self):
      self._base_dir = file_io.join(
          "oss://%s\x01id=%s\x02key=%s\x02host=%s"
          % (bucket, access_id, access_key, host),
          "base_dir",
      )
      file_io.create_dir(self._base_dir)
  
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 3 for calling the OSSFSTest obj's underlying member method code with example usage: obj.setUp() without return types