As mentioned in commits like a586ba806, a7664ad81, 006128da5, b41fbfa52
and c480cdd91, accessing the database after starting the browser with
the `visit` method sometimes results in database corruption and failing
tests on our CI due to the process running the test accessing the
database after the process running the browser has started.
In this case, we're avoiding the usage of `user.subscriptions_token` and
`Comment.last`. In the future, we should probably simplify these tests
by moving most of the checks to a mailer test.
1c2ec3f37e