silverstripe-framework/tests/php/Security/MemberAuthenticator/SessionAuthenticationHandlerTest.yml

'SilverStripe\Security\Group':
  usergroup:
    Title: usergroup
    Code: usergroup
'SilverStripe\Security\Member':
  test:
    FirstName: Test
    Surname: User
    Email: testuser@example.com
    Password: 1nitialPassword
    Groups: '=>SilverStripe\Security\Group.usergroup'