These blocks are no longer used:
* `allowed_phase_list` isn't used since commit 04605d5d5
* `level_two_user` isn't used since commit 26d14cbd0
* `heading` in `budgets/stats_spec` was added in c2457e36a but never
used
* `translatable` was added in 44d137a4c but it's overwritten in all the
contexts.
* `annotation` isn't used since commit 79d00e7b9
* `admin` in `tags/budget_investments_spec` isn't used since 8a2e15980
* `budget` in `welcome_spec` was added in 87be6f302 but never used
System tests are used to test the application from the user's point of
view. To test for specific exceptions, particularly regarding
authorization permissions, controller tests fit better.
Another option would be to test the page displayed shows a certain text,
like "Internal server error". I'm choosing controller tests because
they're faster and we're basically testing the same scenario many times
and we've already got a test checking what happens when users access a
page raising an exception.
