SilverStripe\Dev\Tests\YamlFixtureTest\DataObjectRelation:
  relation1:
    Name: Relation1
  relation2:
    Name: Relation2
SilverStripe\Dev\Tests\YamlFixtureTest\TestDataObject:
  testobject1:
    Name: TestObject1
    ManyManyRelation: =>SilverStripe\Dev\Tests\YamlFixtureTest\DataObjectRelation.relation1,=>SilverStripe\Dev\Tests\YamlFixtureTest\DataObjectRelation.relation2
  testobject2:
    Name: TestObject2
    ManyManyRelation: =>SilverStripe\Dev\Tests\YamlFixtureTest\DataObjectRelation.relation1