diff --git a/spec/dummy/app/controllers/application_controller.rb b/spec/dummy/app/controllers/application_controller.rb
index b2166115b..b3f1592c2 100644
--- a/spec/dummy/app/controllers/application_controller.rb
+++ b/spec/dummy/app/controllers/application_controller.rb
@@ -6,6 +6,8 @@ class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
 
   def current_user
+    # :nocov:
     raise NotImplementedError
+    # :nocov:
   end
 end