I struggled with this for a while, but I finally got it.
I have a series of Rails applications that authenticates through a single OAuth provider app. After authenticating successfully, the OAuth provider creates a multi-domain signed cookie that can be read by all of the apps, so the user will only have to authenticate once. It’s sort of a Single Sign On (SSO) solution that our team thought of a year ago.
Unfortunately, we didn’t have enough knowledge and time to create automated tests, so we just made the feature without writing the tests. Fast forward to today, I decided to go back and do the right thing, so here we are.
At the time of writing, I haven’t found a solution on how to create signed cookies in Capybara on the Internet. The closest thing I got was this post, but it wasn’t exactly the solution that I was looking for. It was also outdated and it wasn’t working for Rails 4.1.
I had to dig deep into the source of ActionDispatch just to understand what I was missing in the CookieJar creation. Here’s an example on how to use this little helper: