Non-blocking - this is totally fine as is, but since get_policy is used to retrieve the policy, and it's already fairly well tested, it might be easier to read/shorter if the selection CQL is skipped in favor of just asserting that `get_policy` is called.

I wouldn't have mentioned this except that this helper function mainly asserts that the events are updated, and it'd be easier to infer that if that were the main thrust of this function.