JavaScript is used by about 98% of web users, so by testing without it
enabled, we're only testing that the application works for a very
reduced number of users.
We proceeded this way in the past because CONSUL started using Rails 4.2
and truncating the database between JavaScript tests with database
cleaner, which made these tests terribly slow.
When we upgraded to Rails 5.1 and introduced system tests, we started
using database transactions in JavaScript tests, making these tests much
faster. So now we can use JavaScript tests everywhere without critically
slowing down our test suite.
Before clicking the "Edit phase" link, there's already a "Name" field
present in the page (the name of the budget).
With the rack driver, there's no problem since the `fill_in` action
waits until the page is loaded.
However, the test will be a flaky spec if we use a driver supporting
JavaScript, since clicking the "Edit phase" link will cause an AJAX
request and the `fill_in` action might be executed before the AJAX
request is finished.
We were repeating the same code over and over (with a few variants) to
setup tests which require an administrator. We can use a tag and
simplify the code.
