Make `assert_recognizes` to traverse mounted engines

Before this commit paths of mounted engines are not traversed
when `assert_recognizes` is called, causing strange test results.
This commit enable to traverse mounted paths.

3 files changed, 15 insertions, 6 deletions

diff --git a/actionpack/lib/action_dispatch/routing/endpoint.rb b/actionpack/lib/action_dispatch/routing/endpoint.rb
index 88aa13c3e8..819305615e 100644
--- a/actionpack/lib/action_dispatch/routing/endpoint.rb
+++ b/actionpack/lib/action_dispatch/routing/endpoint.rb
@@ -1,10 +1,12 @@
 module ActionDispatch
   module Routing
     class Endpoint # :nodoc:
-      def dispatcher?;   false; end
-      def redirect?;     false; end
-      def matches?(req); true;  end
-      def app;           self;  end
+      def dispatcher?;                           false; end
+      def redirect?;                             false; end
+      def engine?;       rack_app.respond_to?(:routes); end
+      def matches?(req);                          true; end
+      def app;                                    self; end
+      def rack_app;                                app; end
     end
   end
 end
diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index 5d30a545a2..4e859fbac3 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -13,7 +13,7 @@ module ActionDispatch
       end
 
       def rack_app
-        app.app
+        app.rack_app
       end
 
       def path
@@ -45,7 +45,7 @@ module ActionDispatch
       end
 
       def engine?
-        rack_app.respond_to?(:routes)
+        app.engine?
       end
     end
 
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 16237bd564..d8df247068 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -751,6 +751,10 @@ module ActionDispatch
         end
 
         req = make_request(env)
+        recognize_path_with_request(req, path, extras)
+      end
+
+      def recognize_path_with_request(req, path, extras)
         @router.recognize(req) do |route, params|
           params.merge!(extras)
           params.each do |key, value|
@@ -770,6 +774,9 @@ module ActionDispatch
             end
 
             return req.path_parameters
+          elsif app.matches?(req) && app.engine?
+            path_parameters = app.rack_app.routes.recognize_path_with_request(req, path, extras)
+            return path_parameters
           end
         end