def METHOD_NAME(cls):
    super().METHOD_NAME()
    super().loadOntology()
    cls.custom_data_type_graphid = "ceed156d-aadf-4a13-b383-c044624c64bb"
    cls.custom_datatype_graph_filename = os.path.join(
        test_settings.TEST_ROOT,
        "fixtures",
        "resource_graphs",
        "relational_data_model_tests.json",
    )
    cls.custom_string_datatype_filename = os.path.join(
        test_settings.TEST_ROOT,
        "fixtures",
        "datatypes",
        "extended_string_datatype.py",
    )
    custom_string_datatype_name = "extended-string-datatype"
    custom_string_datatype = DDataType.objects.filter(datatype=custom_string_datatype_name)
    if custom_string_datatype is None or len(custom_string_datatype) != 1:
        management.call_command("datatype", "register", source=cls.custom_string_datatype_filename)
    else:
        cls.custom_string_datatype_existed = True
    graph = Graph.objects.filter(graphid=cls.custom_data_type_graphid)
    # Create the Datatype Graph if it doesn't exist
    if len(graph) != 1:
        print("Creating custom data type graph")
        management.call_command(
            "packages",
            operation="import_graphs",
            source=cls.custom_datatype_graph_filename,
        )
    else:
        print("Graph existed: %s" % str(graph))
        cls.custom_data_type_graph_existed = True