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, 46 insertions, 0 deletions

diff --git a/actionsystemtest/lib/action_system_test/driver_adapters.rb b/actionsystemtest/lib/action_system_test/driver_adapters.rb
new file mode 100644
index 0000000000..aead9d6f60
--- /dev/null
+++ b/actionsystemtest/lib/action_system_test/driver_adapters.rb
@@ -0,0 +1,46 @@
+module ActionSystemTest
+  # == System Testing Driver Adapters
+  #
+  # By default Rails supports Capybara with the Selenium Driver. Rails provides
+  # configuration setup for using the selenium driver with Capybara.
+  # Additionally Rails can be used as a layer between Capybara and its other
+  # supported drivers: +:rack_test+, +:selenium+, +:webkit+, or +:poltergeist+.
+  #
+  # *{RackTest}[https://github.com/jnicklas/capybara#racktest]
+  # *{Selenium}[http://seleniumhq.org/docs/01_introducing_selenium.html#selenium-2-aka-selenium-webdriver]
+  # *{Webkit}[https://github.com/thoughtbot/capybara-webkit]
+  # *{Poltergeist}[https://github.com/teampoltergeist/poltergeist]
+  #
+  # === Driver Features
+  #
+  # |                 | Default Browser       | Supports Screenshots? |
+  # |-----------------|-----------------------|-----------------------|
+  # | Rails' Selenium | Chrome                | Yes                   |
+  # | Rack Test       | No JS Support         | No                    |
+  # | Selenium        | Firefox               | Yes                   |
+  # | WebKit          | Headless w/ Qt        | Yes                   |
+  # | Poltergeist     | Headless w/ PhantomJS | Yes                   |
+  module DriverAdapters
+    extend ActiveSupport::Autoload
+
+    autoload :CapybaraDriver
+    autoload :RailsSeleniumDriver
+
+    class << self
+      # Returns driver for specified name.
+      #
+      #   ActionSystemTest::DriverAdapters.lookup(:rails_selenium_driver)
+      #   # => ActionSystemTest::DriverAdapters::RailsSeleniumDriver
+      def lookup(driver)
+        if CapybaraDriver::CAPYBARA_DEFAULTS.include?(driver)
+          CapybaraDriver.new(name: driver)
+        elsif driver.is_a?(Symbol)
+          klass = const_get(driver.to_s.camelize)
+          klass.new
+        else
+          driver
+        end
+      end
+    end
+  end
+end