def test_stopThreadPool(self):
        reactor = self.buildReactor()
        threadpool = ref(reactor.getThreadPool())
        reactor.callWhenRunning(reactor.stop)
        self.runReactor(reactor)
        gc.collect()
        self.assertIdentical(threadpool(), None)
When the reactor stops, L{ReactorBase._stopThreadPool} drops the
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/test/test_threads.py/ThreadTestsBuilder.test_stopThreadPool