silverstripe-framework/admin/tests/ModelAdminTest.yml

ModelAdminTest_Contact:
   sam:
      Name: Sam
      Phone: 021 123 456
   ingo:
      Name: ingo
      Phone: 04 987 6543
      
Member:
   admin:
      FirstName: admin
Group:
   admin:
      Title: Admin
      Members: =>Member.admin
Permission:
   admin:
      Code: ADMIN
      Group: =>Group.admin