diff --git a/actionpack/lib/action_controller.rb b/actionpack/lib/action_controller.rb
index 073600f69b..e822a11d14 100644
--- a/actionpack/lib/action_controller.rb
+++ b/actionpack/lib/action_controller.rb
@@ -40,6 +40,18 @@ module ActionController
   autoload :Translation,              'action_controller/translation'
   autoload :Cookies,                  'action_controller/base/cookies'
 
+  autoload :ActionControllerError,    'action_controller/base/exceptions'
+  autoload :SessionRestoreError,      'action_controller/base/exceptions'
+  autoload :RenderError,              'action_controller/base/exceptions'
+  autoload :RoutingError,             'action_controller/base/exceptions'
+  autoload :MethodNotAllowed,         'action_controller/base/exceptions'
+  autoload :NotImplemented,           'action_controller/base/exceptions'
+  autoload :UnknownController,        'action_controller/base/exceptions'
+  autoload :MissingFile,              'action_controller/base/exceptions'
+  autoload :RenderError,              'action_controller/base/exceptions'
+  autoload :SessionOverflowError,     'action_controller/base/exceptions'
+  autoload :UnknownHttpMethod,        'action_controller/base/exceptions'
+
   require 'action_controller/routing'
 end
 
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index a7957ed944..1333a9d71a 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -15,7 +15,7 @@ require 'active_support/test_case'
 require 'action_controller/abstract'
 require 'action_controller'
 require 'fixture_template'
-require 'action_controller/testing/process2'
+require 'action_controller/testing/process'
 require 'action_view/test_case'
 require 'action_controller/testing/integration'
 require 'active_support/dependencies'
@@ -59,63 +59,6 @@ module ActionController
   }
   Base.session_store = nil
 
-  class ActionControllerError < StandardError #:nodoc:
-  end
-
-  class SessionRestoreError < ActionControllerError #:nodoc:
-  end
-
-  class RenderError < ActionControllerError #:nodoc:
-  end
-
-  class RoutingError < ActionControllerError #:nodoc:
-    attr_reader :failures
-    def initialize(message, failures=[])
-      super(message)
-      @failures = failures
-    end
-  end
-
-  class MethodNotAllowed < ActionControllerError #:nodoc:
-    attr_reader :allowed_methods
-
-    def initialize(*allowed_methods)
-      super("Only #{allowed_methods.to_sentence(:locale => :en)} requests are allowed.")
-      @allowed_methods = allowed_methods
-    end
-
-    def allowed_methods_header
-      allowed_methods.map { |method_symbol| method_symbol.to_s.upcase } * ', '
-    end
-
-    def handle_response!(response)
-      response.headers['Allow'] ||= allowed_methods_header
-    end
-  end
-
-  class NotImplemented < MethodNotAllowed #:nodoc:
-  end
-
-  class UnknownController < ActionControllerError #:nodoc:
-  end
-
-  class MissingFile < ActionControllerError #:nodoc:
-  end
-
-  class RenderError < ActionControllerError #:nodoc:
-  end
-
-  class SessionOverflowError < ActionControllerError #:nodoc:
-    DEFAULT_MESSAGE = 'Your session data is larger than the data column in which it is to be stored. You must increase the size of your data column if you intend to store large data.'
-
-    def initialize(message = nil)
-      super(message || DEFAULT_MESSAGE)
-    end
-  end
-
-  class UnknownHttpMethod < ActionControllerError #:nodoc:
-  end
-  
   class Base
     include ActionController::Testing
   end