code: def test_read_when_s3_log_missing(self):
      ti = copy.copy(self.ti)
      ti.state = TaskInstanceState.SUCCESS
      self.s3_task_handler._read_from_logs_server = mock.Mock(
          return_value=([], [])
      )
      log, metadata = self.s3_task_handler.read(ti)
      assert 1 == len(log)
      assert len(log) == len(metadata)
      actual = log[0][0][-1]
      expected = "*** No logs found on s3 for ti=<TaskInstance: dag_for_testing_s3_task_handler.task_for_testing_s3_log_handler test [success]>\n"
      assert actual == expected
      assert {"end_of_log": True, "log_pos": 0} == metadata[0]
  
imports: from __future__ import annotations
  import contextlib
  import copy
  import os
  from unittest import mock
  import boto3
  import moto
  import pytest
  from botocore.exceptions import ClientError
  from airflow.models import DAG, DagRun, TaskInstance
  from airflow.operators.empty import EmptyOperator
  from airflow.providers.amazon.aws.hooks.s3 import S3Hook
  from airflow.providers.amazon.aws.log.s3_task_handler import S3TaskHandler
  from airflow.utils.session import create_session
  from airflow.utils.state import State, TaskInstanceState
  from airflow.utils.timezone import datetime
  from tests.test_utils.config import conf_vars
label_desc: Use image node_id 10 for calling the TestS3TaskHandler obj's underlying member method code with example usage: obj.test_read_when_s3_log_missing() without return types