allows symbol access to cookies

[Anorlondo448]

I think it's better if cookies method allows symbol access.

Symbol is available for cookies method in Ruby on Rails, but not available for testing.
Because rack-test is used in Ruby on Rails, but not allow symbol access to cookies.
This problem is also written in RUBY ON RAILS TUTORIAL (RAILS 5).
(@chapter 9.3)

There’s one more subtlety, which is that for some reason inside tests the cookies method doesn’t > work with symbols as keys, so that

cookies[:remember_token]
is always nil. Luckily, cookies does work with string keys, so that

cookies['remember_token']
has the value we need.

Ruby on Rails cookies method
https://github.com/rails/rails/blob/15a972e080d7712aa2eb04f21472398457d1439c/actionpack/lib/action_dispatch/middleware/cookies.rb#L315%23L317

# Returns the value of the cookie by +name+, or +nil+ if no such cookie exists.
def [](name)
  @cookies[name.to_s]
end

I hope that this PR will be merged.
Regards.

[perlun]

I think we should move this closer to the other tests for Rack::Test::CookieJar, around line 46 would make sense. Could you fix that @Anorlondo448 and also rebase on latest master so we can see that Travis is still happy with this change in place?

[dennissivia]

@Anorlondo448 are you still available for the change that has been requested.
Otherwise I would just "re-implement" the change on the current master and open a PR that places the test at the right spot. What do you think @perlun ?

[perlun]

@scepticulous let's give it a few days first. If he doesn't seem to be around I'm fine with you closing this PR and rebasing the change on master with the test at the right spot.

[Anorlondo448]

@perlun , @scepticulous
I am sorry to keep you waiting.
I modified PR.
Thanks to your review!

[perlun]

Thanks for your contribution @Anorlondo448!