def METHOD_NAME(self) -> ProcessInstanceModel:
    initiator_user = self.find_or_create_user("initiator_user")
    process_model = load_test_spec(
        process_model_id="test_group/model_with_lanes",
        bpmn_file_name="lanes.bpmn",
        process_model_source_directory="model_with_lanes",
    )
    process_instance = self.create_process_instance_from_process_model(
        process_model=process_model, user=initiator_user
    )
    return process_instance