1 files changed, 23 insertions, 3 deletions
diff --git a/actionpack/lib/action_dispatch/system_testing/driver.rb b/actionpack/lib/action_dispatch/system_testing/driver.rb
index 8decb54419..65e43d3584 100644
--- a/actionpack/lib/action_dispatch/system_testing/driver.rb
+++ b/actionpack/lib/action_dispatch/system_testing/driver.rb
@@ -1,18 +1,38 @@
 module ActionDispatch
   module SystemTesting
     class Driver # :nodoc:
-      def initialize(name)
+      def initialize(name, **options)
         @name = name
+        @browser = options[:using]
+        @screen_size = options[:screen_size]
       end
 
       def use
-        @current = Capybara.current_driver
-        Capybara.current_driver = @name
+        register if selenium?
+        setup
       end
 
       def reset
         Capybara.current_driver = @current
       end
+
+      private
+        def selenium?
+          @name == :selenium
+        end
+
+        def register
+          Capybara.register_driver @name do |app|
+            Capybara::Selenium::Driver.new(app, browser: @browser).tap do |driver|
+              driver.browser.manage.window.size = Selenium::WebDriver::Dimension.new(*@screen_size)
+            end
+          end
+        end
+
+        def setup
+          Capybara.current_driver = @name
+          @current = Capybara.current_driver
+        end
     end
   end
 end