Code review comment for lp:~danilo/launchpad/merge-ss-with-filters-urls

Just one minor change needed, which we discussed on IRC:

[13:57] gmb:
danilo: self.structure and self.ws_structure in TestStructuralSubscriptionTargetAPI are a bit ambiguous - enough so that a reader would need to find their definition to find out what they are, anyway. I think that self.subscription_target and .ws_subscription_target would be better names. What do you think?
[13:57] danilos:
gmb, agreed!