Capybara screenshot feature in tests is broken

[ragesoss]

What is happening?

When a feature test fails, the configuration in rails_helper.rb is used to attempt to make a screenshot (which can be helpful for diagnosing a failing browser-based feature spec). The Capybara screenshot interface seems to have changed, so the call for creating a screenshot throws a NoMethodError. For example, the second part of this failure output:

  1) Assigned Articles view lets users submit feedback about articles
     Got 0 failures and 2 other errors:

     1.1) Failure/Error: find('textarea.feedback-form').fill_in with: 'This is a great article!'

          Capybara::ElementNotFound:
            Unable to find css "textarea.feedback-form"
          # ./spec/features/assigned_articles_spec.rb:26:in `block (3 levels) in <top (required)>'
          # ./spec/features/assigned_articles_spec.rb:22:in `block (2 levels) in <top (required)>'

     1.2) Failure/Error: Capybara::Screenshot.new.screenshot_and_save_page if example.exception

          NoMethodError:
            undefined method `new' for Capybara::Screenshot:Module

                Capybara::Screenshot.new.screenshot_and_save_page if example.exception
                                    ^^^^
          # ./spec/rails_helper.rb:101:in `block (2 levels) in <top (required)>'

Fix this so that screenshots are properly generated when a feature spec fails.