Refactor driver adapter getter/setter

This makes it easier to ask the system test what driver adapter it is
currently using, and makes it easier to change that setting when
necessary.

2 files changed, 10 insertions, 5 deletions

diff --git a/actionpack/lib/system_testing/driver_adapter.rb b/actionpack/lib/system_testing/driver_adapter.rb
index 6d94582395..3958fa4559 100644
--- a/actionpack/lib/system_testing/driver_adapter.rb
+++ b/actionpack/lib/system_testing/driver_adapter.rb
@@ -5,11 +5,16 @@ module SystemTesting
     extend ActiveSupport::Concern
 
     module ClassMethods
-      attr_accessor :driver_adapter
+      def default_driver
+        :capybara_rack_test_driver
+      end
+
+      def driver
+        @driver ||= DriverAdapters.lookup(default_driver).new
+      end
 
-      def driver_adapter=(driver_name_or_class)
-        driver = DriverAdapters.lookup(driver_name_or_class).new
-        driver.call
+      def driver=(adapter: default_driver, settings: {})
+        @driver = DriverAdapters.lookup(adapter).new(settings)
       end
     end
   end
diff --git a/actionpack/lib/system_testing/railtie.rb b/actionpack/lib/system_testing/railtie.rb
index aa3df29344..f77184ad3d 100644
--- a/actionpack/lib/system_testing/railtie.rb
+++ b/actionpack/lib/system_testing/railtie.rb
@@ -4,7 +4,7 @@ module SystemTesting
 
     initializer "system_testing.set_configs" do |app|
       options = app.config.system_testing
-      options.driver_adapter ||= :capybara_rack_test_driver
+      options.driver ||= {}
 
       ActiveSupport.on_load(:system_testing) do
         options.each { |k,v| send("#{k}=", v) }