code: def mock_upload_file(self, Filename, Bucket, Key):
      with open(Filename) as f:
          lines = f.readlines()
          for line in lines:
              self.output_queue.append(json.loads(line))
  
imports: from __future__ import annotations
  import json
  from datetime import datetime
  from decimal import Decimal
  from unittest.mock import MagicMock, patch
  import pytest
  from airflow import DAG
  from airflow.exceptions import AirflowProviderDeprecationWarning
  from airflow.models import DagRun, TaskInstance
  from airflow.providers.amazon.aws.transfers.base import _DEPRECATION_MSG
  from airflow.providers.amazon.aws.transfers.dynamodb_to_s3 import DynamoDBToS3Operator, JSONEncoder
  from airflow.utils import timezone
label_desc: Use image node_id 2 for calling the TestDynamodbToS3 obj's underlying member method code with example usage: obj.mock_upload_file(Filename, Bucket, Key) without return types