Use anonymous? that works on both Ruby 1.8 and 1.9.

actionpack/lib/action_controller/metal/params_wrapper.rb

@@ -2,6 +2,7 @@
 require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/hash/except'
 require 'active_support/core_ext/array/wrap'
+require 'active_support/core_ext/module/anonymous'
 require 'action_dispatch/http/mime_types'
 
 module ActionController
@@ -140,7 +141,7 @@ def inherited(klass)
       # This method also does namespace lookup. Foo::Bar::UsersController will
       # try to find Foo::Bar::User, Foo::User and finally User.
       def _default_wrap_model #:nodoc:
-        return nil if self.name.nil?
+        return nil if self.anonymous?
 
         model_name = self.name.sub(/Controller$/, '').singularize
 
@@ -170,7 +171,7 @@ def _set_wrapper_defaults(options, model=nil)
           end
         end
 
-        unless options[:name] || self.name.nil?
+        unless options[:name] || self.anonymous?
           model ||= _default_wrap_model
           options[:name] = model ? model.to_s.demodulize.underscore :
             controller_name.singularize

actionpack/lib/action_controller/test_case.rb

@@ -2,6 +2,7 @@
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/object/to_query'
 require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/module/anonymous'
 
 module ActionController
   module TemplateAssertions
@@ -413,9 +414,9 @@ def process(action, parameters = nil, session = nil, flash = nil, http_method =
         @request.env['REQUEST_METHOD'] = http_method
 
         parameters ||= {}
-        controller_class_name = @controller.class.name ?
-          @controller.class.name.underscore.sub(/_controller$/, '') :
-          "anonymous_controller"
+        controller_class_name = @controller.class.anonymous? ?
+          "anonymous_controller" :
+          @controller.class.name.underscore.sub(/_controller$/, '')
 
         @request.assign_parameters(@routes, controller_class_name, action.to_s, parameters)