code: def test_unsupported(self):
      shell = MockShell()
      f = run.StdInputFile(shell, "stdin")
      self.assertRaises(OSError, f.fileno)
      self.assertRaises(OSError, f.tell)
      self.assertRaises(OSError, f.seek, 0)
      self.assertRaises(OSError, f.write, "x")
      self.assertRaises(OSError, f.writelines, ["x"])
  
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 StdInputFilesTest obj's underlying member method code with example usage: obj.test_unsupported() without return types