Many missing RouterLinkStubs in component tests

Many component tests, both skipped and non-skipped, are showing errors related to the router-link component. Either it is not defined at all, in a shallow mount:

[Vue warn]: Failed to resolve component: router-link
If this is a native custom element, make sure to exclude it from component resolution via compilerOptions.isCustomElement. 
  at <Member member= {
  id: 'member_id',
  level: 20,
  user: { id: 'user_id', email: 'james@test.me', display_name: 'James' },
  group: null
} ref="VTU_COMPONENT" > 
  at <VTUROOT>

Or it is defined, because it was mounted with a regular mount, but it was not stubbed and therefore does not work:

[Vue warn]: Component is missing template or render function. 
  at <RouterLink class="dropdown-item" disabled=true to=""  ... > 
  at <HeaderActions corpusId="corpusid" ref="VTU_COMPONENT" > 
  at <VTUROOT>