silverstripe-restfulserver/tests/unit/JSONDataFormatterTest.yml

SilverStripe\RestfulServer\Tests\Stubs\JSONDataFormatterTypeTestObject:
  foo:
    ID: 8
    Name: Test Object 1
  parent:
    ID: 9
    Name: Test Object
    Children: =>SilverStripe\RestfulServer\Tests\Stubs\JSONDataFormatterTypeTestObject.foo