code: def testHandlerReplacedButCalled(self):
      # Can't use skipIf decorator because the signal handler may have
      # been changed after defining this method.
      if signal.getsignal(signal.SIGINT) == signal.SIG_IGN:
          self.skipTest("test requires SIGINT to not be ignored")
  
      def test_function():
          # If our handler has been replaced (is no longer installed) but is
          # called by the *new* handler, then it isn't safe to delay the
          # SIGINT and we should immediately delegate to the default handler
          unittest.installHandler()
  
          handler = signal.getsignal(signal.SIGINT)
  
          def new_handler(frame, signum):
              handler(frame, signum)
  
          signal.signal(signal.SIGINT, new_handler)
  
          try:
              os.kill(os.getpid(), signal.SIGINT)
          except KeyboardInterrupt:
              pass
          else:
              self.fail(
                  "replaced but delegated handler doesn't raise interrupt"
              )
  
      self.withRepeats(test_function)
  
imports: import gc
  import io
  import os
  import sys
  import signal
  import weakref
  import unittest
  from test import support
label_desc: Use image node_id 9 for calling the TestBreak obj's underlying member method code with example usage: obj.testHandlerReplacedButCalled() without return types