class_docstr: Unit tests for Agent class
code: def config(self, llm: FakeLLM) -> dict:
      return {"llm": llm}
  
imports: from typing import Optional
  from unittest.mock import Mock
  from pandasai.agent import Agent
  import pandas
  import pytest
  from pandasai.llm.fake import FakeLLM
  from pandasai.prompts.clarification_questions_prompt import ClarificationQuestionPrompt
  from pandasai.prompts.explain_prompt import ExplainPrompt
  from pandasai.smart_datalake import SmartDatalake
label_desc: Use image node_id 3 for calling the TestAgent obj's underlying member method code with example usage: obj.config(llm) and returns: dict