diff --git a/actionpack/lib/action_controller/test_process.rb b/actionpack/lib/action_controller/test_process.rb
index 8dd2e443ae3ae64b3517906a2d1fdcb1b3e9e944..8e6c81b375c25ce9f3109e06618683a8dc4c4dee 100644
--- a/actionpack/lib/action_controller/test_process.rb
+++ b/actionpack/lib/action_controller/test_process.rb
@@ -72,10 +72,16 @@ def assign_parameters(controller_path, action, parameters)
       extra_keys = ActionController::Routing::Routes.extra_keys(parameters)
       non_path_parameters = get? ? query_parameters : request_parameters
       parameters.each do |key, value|
+        if value.is_a? Fixnum
+          value = value.to_s
+        elsif value.is_a? Array
+          value = ActionController::Routing::PathComponent::Result.new(value)
+        end
+
         if extra_keys.include?(key.to_sym)
           non_path_parameters[key] = value
         else
-          path_parameters[key] = value.is_a?(Fixnum) ? value.to_s : value
+          path_parameters[key.to_s] = value
         end
       end
     end                        
@@ -352,6 +358,36 @@ def method_missing(selector, *args)
           return @controller.send(selector, *args) if ActionController::Routing::NamedRoutes::Helpers.include?(selector)
           return super
         end
+
+        # A helper to make it easier to test different route configurations.
+        # This method temporarily replaces ActionController::Routing::Routes
+        # with a new RouteSet instance. 
+        #
+        # The new instance is yielded to the passed block. Typically the block
+        # will create some routes using map.draw { map.connect ... }:
+        #
+        #   with_routing do |set|
+        #     set.draw { set.connect ':controller/:id/:action' }
+        #     assert_equal(
+        #        ['/content/10/show', {}],
+        #        set.generate(:controller => 'content', :id => 10, :action => 'show')
+        #     )
+        #   end
+        #
+        def with_routing
+          real_routes = ActionController::Routing::Routes
+          ActionController::Routing.send :remove_const, :Routes
+
+          temporary_routes = ActionController::Routing::RouteSet.new
+          ActionController::Routing.send :const_set, :Routes, temporary_routes
+          
+          yield temporary_routes
+        ensure
+          if ActionController::Routing.const_defined? :Routes
+            ActionController::Routing.send(:remove_const, :Routes) 
+          end
+          ActionController::Routing.const_set(:Routes, real_routes) if real_routes
+        end
     end
   end
 end
diff --git a/actionpack/test/controller/test_test.rb b/actionpack/test/controller/test_test.rb
index 996c3c6cc2e9e610d42fe6a830c6099e54b1028c..201fe03b448010705495fc1d1cf4fa015c6156d8 100644
--- a/actionpack/test/controller/test_test.rb
+++ b/actionpack/test/controller/test_test.rb
@@ -114,10 +114,44 @@ def test_params_passing
     )
   end
 
-  def test_path_params_are_strings
+  def test_id_converted_to_string
     get :test_params, :id => 20, :foo => Object.new
-    @request.path_parameters.each do |key, value|
-      assert_kind_of String, value
+    assert_kind_of String, @request.path_parameters['id']
+  end
+
+  def test_array_path_parameter_handled_properly
+    with_routing do |set|
+      set.draw do 
+        set.connect 'file/*path', :controller => 'test_test/test', :action => 'test_params'
+        set.connect ':controller/:action/:id'
+      end
+      
+      get :test_params, :path => ['hello', 'world']
+      assert_equal ['hello', 'world'], @request.path_parameters['path']
+      assert_equal 'hello/world', @request.path_parameters['path'].to_s
+    end
+  end
+
+  def test_assert_realistic_path_parameters
+    get :test_params, :id => 20, :foo => Object.new
+
+    # All elements of path_parameters should use string keys
+    @request.path_parameters.keys.each do |key|
+      assert_kind_of String, key
+    end
+  end
+
+  def test_with_routing_places_routes_back
+    assert ActionController::Routing::Routes
+    routes_id = ActionController::Routing::Routes.object_id
+    
+    begin
+      with_routing { raise 'fail' }
+      fail 'Should not be here.'
+    rescue RuntimeError
     end
+    
+    assert ActionController::Routing::Routes
+    assert_equal routes_id, ActionController::Routing::Routes.object_id
   end
 end