code: def test_invoke_method_invalid(self, connector, openapi_service_mock):
      # Test invalid method invocation
      method_invocation_descriptor = {
          "name": "invalid_method",
          "arguments": {},
      }
      with pytest.raises(RuntimeError):
          connector._invoke_method(
              openapi_service_mock, method_invocation_descriptor
          )
  
file_path: haystack/test/components/connectors/test_openapi_service.py
imports: import json
  import pytest
  from unittest.mock import MagicMock, Mock
  from openapi3 import OpenAPI
  from haystack.components.connectors import OpenAPIServiceConnector
  from haystack.dataclasses import ChatMessage
label_desc: Use image node_id 7 for calling the TestOpenAPIServiceConnector obj's underlying member method code with example usage: obj.test_invoke_method_invalid(connector, openapi_service_mock) without return types