silverstripe-framework/tests/php/Forms/GridField/GridFieldTest.yml

SilverStripe\Forms\Tests\GridField\GridFieldTest\Team:
    team1:
        Name: Team 1
        City: Cologne
    team2:
        Name: Team 2
        City: Wellington
    team3:
        Name: Team 3
        City: Auckland
    team4:
        Name: Team 4
        City: Melbourne
SilverStripe\Forms\Tests\GridField\GridFieldTest\Player:
    player1_team1:
        Name: Player 1
        Email: player1@test.com
        Teams: =>SilverStripe\Forms\Tests\GridField\GridFieldTest\Team.team1
SilverStripe\Forms\Tests\GridField\GridFieldTest\Cheerleader:
  cheerleader1_team1:
    Name: Heather
    Team: =>SilverStripe\Forms\Tests\GridField\GridFieldTest\Team.team4