class_docstr: Unit tests for the openai LLM class
class_docstr_tok: ["Unit","tests","for","the","openai","LLM","class"]
code: def test_completion(self, mocker):
      expected_text = "This is the generated text."
      expected_response = OpenAIObject(
          {
              "choices": [{"text": expected_text}],
              "usage": {
                  "prompt_tokens": 2,
                  "completion_tokens": 1,
                  "total_tokens": 3,
              },
              "model": "gpt-35-turbo",
          }
      )
  
      openai = OpenAI(api_token="test")
      mocker.patch.object(
          openai, "completion", return_value=expected_response
      )
      result = openai.completion("Some prompt.")
  
      openai.completion.assert_called_once_with("Some prompt.")
      assert result == expected_response
  
file_path: pandas-ai/tests/llms/test_openai.py
imports: import openai
  import pytest
  from pandasai.exceptions import APIKeyNotFoundError, UnsupportedModelError
  from pandasai.llm import OpenAI
  from pandasai.prompts import AbstractPrompt
label_desc: Use image node_id 6 for calling the TestOpenAILLM obj's underlying member method code with example usage: obj.test_completion(mocker) without return types