class_docstr: Unit test for Smart Data Lake Code Execution
class_docstr_tok: ["Unit","test","for","Smart","Data","Lake","Code","Execution"]
code: def llm(self, output: Optional[str] = None):
      return FakeLLM(output=output)
  
imports: from typing import Optional
  from unittest.mock import MagicMock, Mock
  import pandas
  import pytest
  from pandasai.exceptions import InvalidLLMOutputType
  from pandasai.helpers.logger import Logger
  from pandasai.helpers.skills_manager import SkillsManager
  from pandasai.llm.fake import FakeLLM
  from pandasai.pipelines.pipeline_context import PipelineContext
  from pandasai.prompts.correct_error_prompt import CorrectErrorPrompt
  from pandasai.prompts.correct_output_type_error_prompt import CorrectOutputTypeErrorPrompt
  from pandasai.smart_dataframe import SmartDataframe
  from pandasai.pipelines.smart_datalake_chat.code_execution import CodeExecution
label_desc: Use image node_id 1 for calling the TestCodeExecution obj's underlying member method code with example usage: obj.llm(output) and returns: FakeLLM