def test_errorLog(self):
        defer.Deferred().addCallback(lambda x: 1 / 0).callback(1)
        gc.collect()
        self._check()
Verify that when a L{Deferred} with no references to it is fired,
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_defer.py/LogTestCase.test_errorLog