code: def test_find_extensions_not_found():
      """Test for raising error if codec not in dictionaries."""
      with pytest.raises(ValueError):  # asking for a silly video format
          tools.find_extension("flashvideo")
  
file_path: moviepy/tests/test_tools.py
imports: import contextlib
  import filecmp
  import importlib
  import io
  import os
  import shutil
  import sys
  import pytest
  import moviepy.tools
  from moviepy.video.io.downloader import download_webfile
label_desc: Use image node_id 2 for calling a global function with example usage: test_find_extensions_not_found() without return types