Added RadioField#checked? to indicated whether or not a radio button is checked.

lib/webrat/core/field.rb

@@ -241,6 +241,10 @@ module Webrat
       set(@element["value"] || "on")
     end
     
+    def checked?
+      @element["checked"] == "checked"
+    end
+    
   protected
 
     def other_options

spec/webrat/core/field_spec.rb

@@ -12,4 +12,16 @@ module Webrat
       checkbox.should_not be_checked
     end
   end
+  
+  describe RadioField do
+    it "should say it is checked if it is" do
+      radio_button = RadioField.new(nil, (Webrat::XML.document("<input type='radio' checked='checked'>").search('input')).first)
+      radio_button.should be_checked
+    end
+
+    it "should say it is not checked if it is not" do
+      radio_button = RadioField.new(nil, (Webrat::XML.document("<input type='radio'>").search('input')).first)
+      radio_button.should_not be_checked
+    end
+  end
 end