final SqlDataClassFactory factory = SqlIntegrationTestSingleton.getSqlDataClassFactory();
final PolyTestClass polyTestClass = factory.newPolyTestClass();
polyTestClass.setString("polyTestClassString");
// {{ Setup self-referencing collection
final PolySelfRefClass polySelfRefClassParent = factory.newPolySelfRefClass();
polySelfRefClassParent.setString("Parent");
final PolySelfRefClass polySelfRefClassChild1 = factory.newPolySelfRefClass();
polySelfRefClassChild1.setString(CHILD_1);
polySelfRefClassParent.addToPolySelfRefClasses(polySelfRefClassChild1);