We're getting a failure on Travis in one of these tests. Debugging shows
the AJAX request rendering the first page (after clicking the "Previous"
link) takes too long and sometimes it exceeds Capybara's timeout.
After running the test thousands of times, the only way I've found to
clearly reduce the number of times the test fails is to reduce the
number of records shown on the first page. Other experiments, like
adding an `includes(:author)` to the query getting the proposals in the
controller, or adding `author: user` to the `create_list` part of the
test (so only one author needs to be fetched when rendering the
proposals) show inconsistent results regarding performance.
Note we still need at least 10 proposals for the test for several users,
to guarantee two users will never get the same records during the test
(or at least the probability they get the same records is one in
millions).
The `type: :feature` is automatically detected by RSpec because these
tests are inside the `spec/features` folder. Using `feature` re-adds a
`type: :feature` to these files, which will result in a conflict when we
upgrade to Rails 5.1's system tests.
Because of this change, we also need to change `background` to `before`
or else these tests will fail.
We make the tests considerably faster, we make them more robust against
changes in the number of records shown per page, and we generate enough
records so the chance of randomly getting the same results twice in a
row is extremely low.
