Turn system testing into it's own gem and rename

Renames `Rails::SystemTestCase` to `ActionSystemTest` and moves it to a
gem under the Rails name.

We need to name the class `ActionSystemTestCase` because the gem expects
a module but tests themselves expect a class.

Adds MIT-LICENSE, CHANGELOG, and README for the future.

1 files changed, 23 insertions, 0 deletions

diff --git a/actionsystemtest/lib/action_system_test/test_helper.rb b/actionsystemtest/lib/action_system_test/test_helper.rb
new file mode 100644
index 0000000000..428f0faeca
--- /dev/null
+++ b/actionsystemtest/lib/action_system_test/test_helper.rb
@@ -0,0 +1,23 @@
+require "capybara/dsl"
+require "action_system_test/test_helpers"
+
+module ActionSystemTest
+  module TestHelper # :nodoc:
+    include TestHelpers::Assertions
+    include TestHelpers::FormHelper
+    include TestHelpers::ScreenshotHelper
+    include Capybara::DSL
+
+    Capybara.app = Rack::Builder.new do
+      map "/" do
+        run Rails.application
+      end
+    end
+
+    def after_teardown
+      take_screenshot if supported?
+      Capybara.reset_sessions!
+      super
+    end
+  end
+end