class_docstr: Unit tests for Agent class
code: def test_explain(self, agent: Agent):
      agent._lake.llm.call = Mock()
      clarification_response = """
  Combine the Data: To find out who gets paid the most, 
  I needed to match the names of people with the amounts of money they earn. 
  It's like making sure the right names are next to the right amounts. 
  I used a method to do this, like connecting pieces of a puzzle.
  Find the Top Earner: After combining the data, I looked through it to find 
  the person with the most money. 
  It's like finding the person who has the most marbles in a game
          """
      agent._lake.llm.call.return_value = clarification_response
  
      response = agent.explain()
  
      assert response == (
          """
  Combine the Data: To find out who gets paid the most, 
  I needed to match the names of people with the amounts of money they earn. 
  It's like making sure the right names are next to the right amounts. 
  I used a method to do this, like connecting pieces of a puzzle.
  Find the Top Earner: After combining the data, I looked through it to find 
  the person with the most money. 
  It's like finding the person who has the most marbles in a game
          """
      )
  
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 12 for calling the TestAgent obj's underlying member method code with example usage: obj.test_explain(agent) without return types