def METHOD_NAME() -> None:
    external_repository = external_repository_for_function(job_def_with_config)
    external_a_job: ExternalJob = external_repository.get_full_external_job("a_job")
    root_config_key = external_a_job.root_config_key
    assert root_config_key
    root_type = external_a_job.config_schema_snapshot.get_config_snap(root_config_key)
    assert (
        default_values_yaml_from_type_snap(external_a_job.config_schema_snapshot, root_type)
        == """ops:
  an_op:
    config:
      a_str_with_default: foo