Add test for single argument calls to scope

test/apps/rails2/app/models/account.rb

 class Account < ActiveRecord::Base
   validates_format_of :name, :with => /^[a-zA-Z]+$/
+
+  named_scope :all
 end

test/apps/rails3.1/app/models/user.rb

@@ -21,4 +21,6 @@ class User < ActiveRecord::Base
     something = something_helper
     where("something = #{something}")
   }
+
+  scope :all
 end