text: import os
  from typing import List, Optional
  
  
  def get_fake_stdin() -> Optional[List[str]]:
      fake_stdin_path = os.getenv("FAKE_STDIN_PATH", None)
  
      if fake_stdin_path is None:
          return None
  
      with open(fake_stdin_path, "rt") as rf:
          lines = [line.strip() for line in rf.readlines()]
      return lines
  