def METHOD_NAME(self):
    """
    Calling C{removeAll} on a reactor includes descriptors that are
    filesystem files.
    """
    reactor = self.buildReactor()
    self.addCleanup(self.unbuildReactor, reactor)
    path = self.mktemp()
    open(path, "wb").close()
    # Cleanup might fail if file is GCed too soon:
    self.f = f = open(path, "rb")
    # Have the reader added:
    stdio = StandardIO(
        Protocol(),
        stdin=f.fileno(),
        stdout=self.extraFile.fileno(),
        reactor=reactor,
    )
    # And then removed:
    removed = reactor.removeAll()
    self.assertIn(stdio._reader, removed)
    self.assertNotIn(stdio._reader, reactor.getReaders())