'Stop the callback handler.'

def tearDown(self):

    OLD_EVENTS.clear()
    OLD_EVENTS.update(self.handler.ndb.events)
    self.handler.stop()
    for script in ScriptDB.objects.filter(db_typeclass_path='evennia.contrib.ingame_python.scripts.TimeEventScript'):
        script.stop()
    CallbackHandler.script = None
    super(TestCmdCallback, self).tearDown()
