code: def test_dalle_image_generation(self, mock_openai, mock_requests_get):
      # Generate a 1x1 white pixel PNG image in memory
      img = PILImage.new("RGB", (1, 1), color="white")
      img_byte_array = BytesIO()
      img.save(img_byte_array, format="PNG")
      mock_image_content = img_byte_array.getvalue()
  
      mock_response = MagicMock()
      mock_response.content = mock_image_content
      mock_requests_get.return_value = mock_response
  
      # Set up the mock for OpenAI instance
      mock_openai_instance = mock_openai.return_value
      mock_openai_instance.images.generate.return_value = (
          ImagesResponse(
              data=[
                  Image(
                      b64_json=None,
                      revised_prompt=None,
                      url="https://images.openai.com/1234.png",
                  )
              ]
          )
      )
  
      function_name = "DallE"
  
      execute_query_fetch_all(
          self.evadb, f"DROP FUNCTION IF EXISTS {function_name};"
      )
  
      create_function_query = f"""CREATE FUNCTION IF NOT EXISTS {function_name}
              IMPL 'evadb/functions/dalle.py';
          """
      execute_query_fetch_all(self.evadb, create_function_query)
  
      gpt_query = f"SELECT {function_name}(prompt) FROM ImageGen;"
      execute_query_fetch_all(self.evadb, gpt_query)
  
      mock_openai_instance.images.generate.assert_called_once_with(
          prompt="a surreal painting of a cat", n=1, size="1024x1024"
      )
  
file_path: evadb/test/unit_tests/test_dalle.py
imports: import unittest
  from io import BytesIO
  from test.util import get_evadb_for_testing
  from typing import List, Optional
  from unittest.mock import MagicMock, patch
  from PIL import Image
  from pydantic import AnyUrl, BaseModel
  from evadb.server.command_handler import execute_query_fetch_all
label_desc: Use image node_id 3 for calling the DallEFunctionTest obj's underlying member method code with example usage: obj.test_dalle_image_generation(mock_openai, mock_requests_get) without return types