The following discussion from !13696 should be addressed: - [ ] @minahilnichols started a [discussion](https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/13696#note_2808143313): (+3 comments) > note to reviewer: moved this to base presenter as this was duplicated logic. We should add tests for when the `unit_type` is different in these method definitions, with it being `invoice_item.unit_type` for Saas and `user` for SM, so these are not missed if changes are made.