I have some CORS functionality where we do a POST to another domain and
redirect things around. For example, on http://art.sy we login via
https://artsyapi.com, receive a ticket that grants you a cookie on the
non-secure http://art.sy domain. This way passwords don't travel over a
clear channel.

I'm trying to test some of this with Capybara. Ideally I'd like to be able
to introduce a second host into the tests, for example on my local
environment I have http://localhost:3000 and http://local.art.sy:3000 that
are the same thing. For Capybara I am thinking I can do
http://127.0.0.1:1234 vs. http://localhost:1234.

My questions are:

   1. How do I get the full URL to which to set the redirect before I open
   a browser (I can get current_url, but it's too late then). What does
   Capybara user internally when you do "visit X"?
   2. Is there a better strategy for adding a second URL in the loop that
   serves the same application during a test?

Thanks,
dB.

That depends on the driver. For Rack-Test
see lib/capybara/rack_test/driver.rb & lib/capybara/rack_test/browser.rb I
assume if you're trying to test CORS you're using a real browser through
Selenium or Poltergeist. Either way, setting Capybara.app_host =
"http://test.local.artsy:3000/" will work for you for the main URL. If you
use config or environment variables to hold the main and login hosts then
you can set them to special values for your tests, and you'll know what
URLs to expect.

Matt