Hi,

I have a feature request regarding the screen size used by System test. 
Currently you initiate the screen size inside 

/test/application_system_test_case.rb
require "test_helper"


class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  driven_by :selenium, using: :chrome, screen_size: [1400, 1400]
end



What if you have a mobile friendly web application, and the app is 
displayed differently depending on the screen size.
Could it be possible to change the size of the browser while running the 
test suite, this could be handy, because nobody wants to change a config 
files in between tests? 

I have found that you can change the screen size using capybara like this. 
I have tested this myself, and works fine. There must be similar solutions 
using poltergeist and webkit as well.
Capybara.current_session.driver.browser.manage.window.resize_to(400, 400)

My initial idea would be to somehow specify in your test, what screen size 
you would like for your tests, and change it depending. What do you think 
about this?

If there is anything else that need to be done in regards to System Test, I 
am open for suggestion, I am eager to contribute. :) 

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