code: def test_get_format_implementation():
      assert get_format_implementation(".py").format_name == "light"
      assert (
          get_format_implementation(".py", "percent").format_name
          == "percent"
      )
      with pytest.raises(JupytextFormatError):
          get_format_implementation(".py", "wrong_format")
  
imports: import pytest
  from nbformat.v4.nbbase import new_notebook
  import jupytext
  from jupytext.compare import compare
  from jupytext.formats import JupytextFormatError, divine_format, get_format_implementation, guess_format, long_form_multiple_formats, read_format_from_metadata, rearrange_jupytext_metadata, short_form_multiple_formats, update_jupytext_formats_metadata, validate_one_format
label_desc: Use image node_id 9 for calling a global function with example usage: test_get_format_implementation() without return types