code: def test_exists_fd(self):
      r, w = os.pipe()
      try:
          self.assertTrue(self.pathmodule.exists(r))
      finally:
          os.close(r)
          os.close(w)
      self.assertFalse(self.pathmodule.exists(r))
  
imports: import genericpath
  import os
  import sys
  import unittest
  import warnings
  from test.support import is_emscripten
  from test.support import os_helper
  from test.support import warnings_helper
  from test.support.script_helper import assert_python_ok
  from test.support.os_helper import FakePath
label_desc: Use image node_id 6 for calling the GenericTest obj's underlying member method code with example usage: obj.test_exists_fd() without return types