Uninitialized constant WebHook::Endpoint when running zeitwerk test

Question

I've recently started the upgrading process of my app to use Rails 6. Some of it is very smooth, some of it not.

The problem I am facing right now is that in a factory bot we define:

factory :webhook_endpoint, class: Webhook::Endpoint do
   ...
end

When running rails zeitwerk:check it simply throws Uninitialized constant WebHookEndpoint.

The module and class is defined in the models folder.

I wonder I need to require or include it for it to realize it exists.