When generating routes, the last defined named route wins. This is in

contrast to route recognition where the first recognized route wins.
This behavior will not exist in Rails 4.0.

See:

  https://github.com/rails/rails/issues/4245
  https://github.com/rails/rails/issues/4164

actionpack/test/controller/base_test.rb

@@ -197,28 +197,36 @@ class UrlOptionsTest < ActionController::TestCase
     rescue_action_in_public!
   end
 
-  def test_path_generation_priority
+  ##
+  # When generating routes, the last defined named route wins.  This is in
+  # contrast to route recognition where the first recognized route wins.
+  # This behavior will not exist in Rails 4.0.
+  #
+  # See:
+  #
+  #   https://github.com/rails/rails/issues/4245
+  #   https://github.com/rails/rails/issues/4164
+  def test_last_named_route_wins
     rs = ActionDispatch::Routing::RouteSet.new
     rs.draw do
-      resources :models
-      match 'special' => 'model#new', :as => :new_model
+      resources :purchases
+      match 'purchase/:product_id' => 'purchases#new', :as => :new_purchase
+      match 'purchase/:product_id' => 'purchases#new', :as => :correct_new_purchase
     end
 
-    url_params = {
-       :action     => "new",
-       :controller => "model",
-       :use_route  => "new_model",
-       :only_path  => true }
-
-    x = Struct.new(:rs, :params, :tc) {
+    x = Struct.new(:rs, :tc) {
       include rs.named_routes.module
-      public :new_model_path
+      public :correct_new_purchase_url
+      public :new_purchase_url
 
-      def url_for(*args)
-        tc.assert_equal([params], args)
-        rs.url_for(*args)
+      def url_for(options)
+        options[:host] = 'example.org'
+        rs.url_for(options)
       end
-    }.new(rs, url_params, self)
+    }.new(rs, self)
+
+    assert_equal "http://example.org/purchase/1", x.correct_new_purchase_url(1)
+    assert_equal "http://example.org/purchase/1", x.new_purchase_url(1)
   end
 
   def test_url_for_params_priority