Refactor to not include `capybara/rails`

Rails itself is not a Rails application so instead of including
`capybara/rails` we should use the code in there to set up the test. The
only reason capybara needs to include capybara/rails in the first place
is because Rails didn't yet support it.

1 files changed, 13 insertions, 2 deletions

diff --git a/actionpack/lib/system_testing/test_helper.rb b/actionpack/lib/system_testing/test_helper.rb
index bb68cfe665..bbf4e469ac 100644
--- a/actionpack/lib/system_testing/test_helper.rb
+++ b/actionpack/lib/system_testing/test_helper.rb
@@ -1,11 +1,22 @@
-require 'capybara/rails'
+require 'capybara/dsl'
 require 'system_testing/test_helpers'
 
 module SystemTesting
   module TestHelper
-    include Capybara::DSL
     include TestHelpers::FormHelper
     include TestHelpers::Assertions
+    include Capybara::DSL
+
+    Capybara.app = Rack::Builder.new do
+      map "/" do
+        run Rails.application
+      end
+    end
+
+    def before_setup
+      Base.driver.call
+      super
+    end
 
     def after_teardown
       Capybara.reset_sessions!