code: def test_report_delete_tempdir(self, mock_report, model):
      # This tests `ReportCheckpointCallback`. The test simulates the end of an epoch,
      # and asserts that the temporary checkpoint directory is deleted afterwards.
      callback = ReportCheckpointCallback()
      callback.model = model
  
      callback.on_epoch_end(0, {"loss": 0})
  
      assert len(ray.train.report.call_args_list) == 1
      metrics, checkpoint = self.parse_call(
          ray.train.report.call_args_list[0]
      )
      assert metrics == {"loss": 0}
      assert checkpoint is not None
      assert checkpoint.path is not None
      assert not os.path.exists(checkpoint.path)
  
imports: from typing import Dict, Tuple
  from unittest.mock import patch
  import os
  import pytest
  import numpy
  import tensorflow
  import ray
  from ray import train
  from ray.air.integrations.keras import ReportCheckpointCallback
  from ray.train.constants import TRAIN_DATASET_KEY
  from ray.train import ScalingConfig
  from ray.train.tensorflow import TensorflowTrainer, TensorflowPredictor, TensorflowCheckpoint
label_desc: Use image node_id 7 for calling the TestReportCheckpointCallback obj's underlying member method code with example usage: obj.test_report_delete_tempdir(mock_report, model) without return types