code: def test_unsupported_llm_type(self):
      self.run_sql("create database proj")
      self.run_sql(
          """
              create model proj.test_unsupported_llm
              predict answer
              using
                  engine='rag',
                  llm_type='unsupported_llm'
          """
      )
      with pytest.raises(Exception):
          self.wait_predictor("proj", "test_unsupported_llm")
  
file_path: mindsdb/tests/unit/ml_handlers/test_rag.py
imports: import os
  import time
  import pandas
  import pytest
  from mindsdb_sql import parse_sql
  from tests.unit.executor_test_base import BaseExecutorTest
label_desc: Use image node_id 5 for calling the TestRAG obj's underlying member method code with example usage: obj.test_unsupported_llm_type() without return types