Test RequestHandler.prepare() and RequestHandler.on_finish() returning deferreds

test.py

import cyclone.web
from twisted.internet import reactor
from twisted.internet.task import deferLater


class TestHandler(cyclone.web.RequestHandler):
    def _prepare(self):
        print "Prepared!"

    def prepare(self):
        print "Preparing"
        return deferLater(reactor, 2, self._prepare)

    def get(self):
        self.write("Hello, world")

    def _on_finish(self):
        print "Finished!"

    def on_finish(self):
        print "On finish"
        return deferLater(reactor, 2, self._on_finish)


def main():
    application = cyclone.web.Application([
        (r"/", TestHandler)
    ], debug=True)

    reactor.listenTCP(8888, application, interface="127.0.0.1")
    reactor.run()


if __name__ == "__main__":
    main()