> I think running the test suite twice is possible, could this be good 
solution though

What I mean is I don't see a way to implement this that wouldn't start 2 
servers and run the tests twice, once in Chrome and once in FF for example.

> I cant find where you instantiate system test from when starting it.

When you run `rails 
test:system` 
https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/system_test_case.rb#L145
 
starts the server and boots the Rails application. `driven_by` is 
initialized when the test starts which is why you if you want multiple 
drivers you need to have multiple classes that call `driven_by` and inherit 
from that class 
(https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/system_test_case.rb#L136-L138).
 
That calls `setup` which initializes Capybara and then Capybara takes over 
from 
there. 
https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/system_testing/driver.rb#L78

-Eileen

On Friday, December 15, 2017 at 4:17:39 PM UTC-5, Pierre Hedkvist wrote:
>
> Thanks for the reply,
>
> I have tried to find a solution, I think running the test suite twice is 
> possible, could this be good solution though? Downside is that it might be 
> slow to start selenium multiple times? 
> I cant find where you instantiate system test from when starting it. I am 
> familiar with your code from this PR 
> <https://github.com/rails/rails/pull/26703> inside of ActionDispatch. But 
> when rails test:system is entered in the terminal,
> from where does rails start the test?
>
>
>
> Den fredag 15 december 2017 kl. 14:12:52 UTC+1 skrev eileencodes:
>>
>> Hi Pierre,
>>
>> That does sound like a useful feature. That would require your test suite 
>> to run twice though, is that desirable? If you'd like to implement this 
>> feature cc me when you open the PR.
>>
>> -Eileen (eileencodes)
>>
>> On Thursday, December 14, 2017 at 7:23:19 AM UTC-5, Pierre Hedkvist wrote:
>>>
>>> Hi,
>>>
>>> I think it could be useful to run System Test with multiple browsers 
>>> when using Selenium, in order to get better testing coverage for different 
>>> browsers.
>>>
>>> For instance if you could put an array of browsers inside the using 
>>> variable:
>>>
>>> require "test_helper"
>>>
>>>
>>> class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
>>>   driven_by :selenium, using: [:chrome, :firefox], screen_size: [1000, 
>>> 1000]
>>> end
>>>
>>>
>>> I know its possible to run capybara with multiple browser using RSpec, 
>>> like this: 
>>> https://stackoverflow.com/questions/39955782/capybara-rspec-how-to-set-up-multi-browser-tc-running
>>>
>>> What are your thoughts?
>>>
>>

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