def METHOD_NAME(self) -> None:
    """
    L{twisted.internet.gtk3reactor} is now just a set of compatibility
    aliases for L{twisted.internet.GIReactor}.
    """
    from twisted.internet.gtk3reactor import (
        Gtk3Reactor,
        PortableGtk3Reactor,
        install,
    )
    self.assertIs(Gtk3Reactor, gireactor.GIReactor)
    self.assertIs(PortableGtk3Reactor, gireactor.PortableGIReactor)
    self.assertIs(install, gireactor.install)
    warnings = self.flushWarnings()
    self.assertEqual(len(warnings), 1)
    self.assertIn(
        "twisted.internet.gtk3reactor was deprecated", warnings[0]["message"]
    )