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, 31 insertions, 0 deletions

diff --git a/actionsystemtest/lib/action_system_test/driver_adapter.rb b/actionsystemtest/lib/action_system_test/driver_adapter.rb
new file mode 100644
index 0000000000..fe12ecaf80
--- /dev/null
+++ b/actionsystemtest/lib/action_system_test/driver_adapter.rb
@@ -0,0 +1,31 @@
+require "action_system_test/driver_adapters"
+
+module ActionSystemTest
+  # The <tt>ActionSystemTest::DriverAdapter</tt> module is used to load the driver
+  # set in your Rails' test configuration file.
+  #
+  # The default driver adapter is the +:rails_selenium_driver+.
+  module DriverAdapter
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def default_driver # :nodoc
+        :rails_selenium_driver
+      end
+
+      # Returns the current driver that is set. If no driver is set in the
+      # Rails' configuration file then +:rails_selenium_driver+ will be
+      # initialized.
+      def driver
+        @driver ||= DriverAdapters.lookup(default_driver)
+      end
+
+      # Specify the adapter and settings for the system test driver set in the
+      # Rails' configuration file.
+      def driver=(driver)
+        @driver = DriverAdapters.lookup(driver)
+        @driver.call
+      end
+    end
+  end
+end