Sure, hindsight is 20/20, but a bunch of these comments are replying to the assertion "And I can't think of one non-contrived reason to do it" (have a single test case with multiple subscriptions). That's the assertion I think is totally weird - I can think of tons of non-contrived reasons to have multiple subscriptions in a single test case.

I wouldn't pillory someone if they left out a test case like this, but neither would I assert that a test case like this is for some reason unthinkable or some outlandish edge case.