def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def resource_setup(cls):
        super(VolumesActionsTest, cls).resource_setup()

        # Create a test shared volume for attach/detach tests
        cls.volume = cls.create_volume()