Hopefully this test allows us to take early action for issues like T165115.
I added a new test which...
- requests mobileview output from beta cluster for a specific revision of an article on the beta cluster
- ensures equal number of opening and closing divs. same for spans.
That way we'll get notified the same day any unbalanced divs or spans land in beta mobileview section html. (so we can catch it before it lands in prod!)