Symbiote\GridFieldExtensions\Tests\Stub\StubHierarchy:
  item1: 
    Title: 'Item 1'
  item1_1:
    Title: 'Item 1.1'
    ParentID: =>Symbiote\GridFieldExtensions\Tests\Stub\StubHierarchy.item1
  item1_1_1:
    Title: 'Item 1.1.1'
    ParentID: =>Symbiote\GridFieldExtensions\Tests\Stub\StubHierarchy.item1_1