silverstripe-framework/tests/security/GroupTest.yml

Group:
   admingroup:
      Code: admingroup
   parentgroup:
      Code: parentgroup
   childgroup:
      Code: childgroup
      Parent: =>Group.parentgroup
   grandchildgroup:
      Code: grandchildgroup
      Parent: =>Group.childgroup
   group1:
      Title: Group 1
   group2:
      Title: Group 2
GroupTest_Member:
   admin:
      FirstName: Admin
      Groups: =>Group.admingroup
   parentgroupuser:
      FirstName: Parent Group User
      Groups: =>Group.parentgroup
   childgroupuser:
      FirstName: Child Group User
      Groups: =>Group.childgroup
   allgroupuser:
      FirstName: All Group User
      Groups: =>Group.admingroup,=>Group.parentgroup,=>Group.childgroup
Permission:
   admincode:
      Code: ADMIN
      Group: =>Group.admingroup