Move and rename system tests

* Move system tests back into Action Pack
* Rename `ActionSystemTest` to `ActionDispatch::SystemTestCase`
* Remove private base module and only make file for public
`SystemTestCase` class, name private module `SystemTesting`
* Rename `ActionSystemTestCase` to `ApplicationSystemTestCase`
* Update corresponding documentation and guides
* Delete old `ActionSystemTest` files

1 files changed, 23 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/system_testing/server.rb b/actionpack/lib/action_dispatch/system_testing/server.rb
new file mode 100644
index 0000000000..62ba07736b
--- /dev/null
+++ b/actionpack/lib/action_dispatch/system_testing/server.rb
@@ -0,0 +1,23 @@
+require "rack/handler/puma"
+
+module ActionDispatch
+  module SystemTesting
+    class Server # :nodoc:
+      def run
+        register
+        setup
+      end
+
+      private
+        def register
+          Capybara.register_server :rails_puma do |app, port, host|
+            Rack::Handler::Puma.run(app, Port: port, Threads: "0:1")
+          end
+        end
+
+        def setup
+          Capybara.server = :rails_puma
+        end
+    end
+  end
+end