diff --git a/actionpack/test/dispatch/prefix_generation_test.rb b/actionpack/test/dispatch/prefix_generation_test.rb
index 7fe11447b86a6..3b47a1b72d725 100644
--- a/actionpack/test/dispatch/prefix_generation_test.rb
+++ b/actionpack/test/dispatch/prefix_generation_test.rb
@@ -14,6 +14,7 @@ def self.routes
             match "/posts", :to => "inside_engine_generating#index", :as => :posts
             match "/url_to_application", :to => "inside_engine_generating#url_to_application"
             match "/polymorphic_path_for_engine", :to => "inside_engine_generating#polymorphic_path_for_engine"
+            match "/conflicting_url", :to => "inside_engine_generating#conflicting"
           end
 
           routes
@@ -37,6 +38,7 @@ def self.routes
             match "/generate", :to => "outside_engine_generating#index"
             match "/polymorphic_path_for_engine", :to => "outside_engine_generating#polymorphic_path_for_engine"
             match "/polymorphic_with_url_for", :to => "outside_engine_generating#polymorphic_with_url_for"
+            match "/conflicting_url", :to => "outside_engine_generating#conflicting"
             root :to => "outside_engine_generating#index"
           end
 
@@ -90,6 +92,10 @@ def url_to_application
       def polymorphic_path_for_engine
         render :text => polymorphic_path(Post.new)
       end
+
+      def conflicting
+        render :text => "engine"
+      end
     end
 
     class ::OutsideEngineGeneratingController < ActionController::Base
@@ -106,6 +112,10 @@ def polymorphic_path_for_engine
       def polymorphic_with_url_for
         render :text => blog_engine.url_for(Post.new)
       end
+
+      def conflicting
+        render :text => "application"
+      end
     end
 
     class EngineObject
@@ -162,6 +172,11 @@ def setup
       assert_equal "/pure-awesomeness/blog/posts/1", last_response.body
     end
 
+    test "[ENGINE] url_helpers from engine have higher priotity than application's url_helpers" do
+      get "/awesome/blog/conflicting_url"
+      assert_equal "engine", last_response.body
+    end
+
     # Inside Application
     test "[APP] generating engine's route includes prefix" do
       get "/generate"