Show routes defined under assets prefix

Closes #9625

Conflicts:
	actionpack/CHANGELOG.md
	actionpack/lib/action_dispatch/routing/inspector.rb

actionpack/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   `rake routes` shows routes defined under assets prefix.
+
+    *Ryunosuke SATO*
+
 *   Label tags generated by collection helpers only inherit the `:index` and
      `:namespace` from the input, because only these attributes modifies the
      `for` attribute of the label. Also, the input attributes don't have

actionpack/lib/action_dispatch/routing/inspector.rb

@@ -69,7 +69,7 @@ def action
       end
 
       def internal?
-        controller.to_s =~ %r{\Arails/(info|welcome)} || path =~ %r{\A#{Rails.application.config.assets.prefix}}
+        controller.to_s =~ %r{\Arails/(info|welcome)} || path =~ %r{\A#{Rails.application.config.assets.prefix}\z}
       end
 
       def engine?

actionpack/test/dispatch/routing/inspector_test.rb

@@ -203,6 +203,18 @@ def test_rake_routes_dont_show_app_mounted_in_assets_prefix
         assert_no_match(/\/sprockets/, output.first)
       end
 
+      def test_rake_routes_shows_route_defined_in_under_assets_prefix
+        output = draw do
+          scope '/sprockets' do
+            get '/foo' => 'foo#bar'
+          end
+        end
+        assert_equal [
+          "Prefix Verb URI Pattern              Controller#Action",
+          "   foo GET  /sprockets/foo(.:format) foo#bar"
+        ], output
+      end
+
       def test_redirect
         output = draw do
           get "/foo"    => redirect("/foo/bar"), :constraints => { :subdomain => "admin" }