code: def test_unsupported(self):
      shell = MockShell()
      f = run.StdOutputFile(shell, "stdout")
      self.assertRaises(OSError, f.fileno)
      self.assertRaises(OSError, f.tell)
      self.assertRaises(OSError, f.seek, 0)
      self.assertRaises(OSError, f.read, 0)
      self.assertRaises(OSError, f.readline, 0)
  
imports: from idlelib import run
  import io
  import sys
  from test.support import captured_output, captured_stderr
  import unittest
  from unittest import mock
  import idlelib
  from idlelib.idle_test.mock_idle import Func
label_desc: Use image node_id 2 for calling the StdOutputFilesTest obj's underlying member method code with example usage: obj.test_unsupported() without return types