code: def test_initialize_with_invalid_url(self, mock_check_valid_model):
      with pytest.raises(ValueError):
          HuggingFaceTGIGenerator(
              model="mistralai/Mistral-7B-v0.1", url="invalid_url"
          )
  
imports: from unittest.mock import patch, MagicMock, Mock
  import pytest
  from huggingface_hub.inference._text_generation import TextGenerationStreamResponse, Token, StreamDetails, FinishReason
  from huggingface_hub.utils import RepositoryNotFoundError
  from haystack.components.generators import HuggingFaceTGIGenerator
  from haystack.dataclasses import StreamingChunk
label_desc: Use image node_id 4 for calling the TestHuggingFaceTGIGenerator obj's underlying member method code with example usage: obj.test_initialize_with_invalid_url(mock_check_valid_model) without return types