Add failing test case for #6053

actionpack/test/controller/test_case_test.rb

@@ -886,3 +886,24 @@ def test_should_be_able_to_use_named_routes_before_a_request_is_done
     end
   end
 end
+
+class AnonymousControllerTest < ActionController::TestCase
+  def setup
+    @controller = Class.new(ActionController::Base) do
+      def index
+        render :text => params[:controller]
+      end
+    end.new
+
+    @routes = ActionDispatch::Routing::RouteSet.new.tap do |r|
+      r.draw do
+        get ':controller(/:action(/:id))'
+      end
+    end
+  end
+
+  def test_controller_name
+    get :index
+    assert_equal 'anonymous', @response.body
+  end
+end
\ No newline at end of file