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.
Sometimes we define URLs for POST requests which are not defined for GET
requests, such as "/residence", so redirecting to it after signing out
results in a routing error.
So instead of using the request referer, we're using the stored location
devise uses, and we're not storing locations in POST requests.
For reasons I'm not sure about, the homepage (and the welcome pages)
were an exception in our "redirect users to the same page they were"
policy.
I'm not sure about the welcome pages (no test was present indicating
they should behave in a special way), but in the case of the home page,
it was a bit annoying to be redirected to a different place after
signing in.
When signing in from a page containing GET params, like
`/budgets/1/investments?heading_id=4`, we were redirected to a URL
without those GET params; in this case, `/budgets/1/investments`.
Using the request fullpath, as recommended in the devise documentation,
keeps these parameters when redirecting.
