code: def test_unsupported(self):
      shell = MockShell()
      f = PseudoOutputFile(shell, "stdout", "utf-8")
      self.assertRaises(IOError, f.fileno)
      self.assertRaises(IOError, f.tell)
      self.assertRaises(IOError, f.seek, 0)
      self.assertRaises(IOError, f.read, 0)
      self.assertRaises(IOError, f.readline, 0)
  
imports: import unittest
  import io
  from idlelib.PyShell import PseudoInputFile, PseudoOutputFile
  from test import test_support
label_desc: Use image node_id 2 for calling the PseudeOutputFilesTest obj's underlying member method code with example usage: obj.test_unsupported() without return types