def __delattr__(cls, name):
    raise TypeError('May not delete attributes on definition class')
A successful subscription should return the current subscription.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/protorpc/protorpc/messages.py/_DefinitionClass.__delattr__--crossover with--dataset/ETHPy150Open ralphm/wokkel/wokkel/test/test_pubsub.py/PubSubServiceTest.test_on_subscribe