code: def test_only_metadata_2(
      text='key="value"', value=("", {"key": "value"})
  ):
      compare(text_to_metadata(text, allow_title=True), value)
      assert metadata_to_text(*value) == text
  
imports: import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell
  import jupytext
  from jupytext.cell_metadata import _IGNORE_CELL_METADATA, RMarkdownOptionParsingError, is_valid_metadata_key, metadata_to_rmd_options, metadata_to_text, parse_key_equal_value, parse_rmd_options, rmd_options_to_metadata, text_to_metadata, try_eval_metadata
  from jupytext.combine import combine_inputs_with_outputs
  from jupytext.compare import compare, compare_notebooks
  from jupytext.metadata_filter import filter_metadata
label_desc: Use image node_id 11 for calling a global function with example usage: test_only_metadata_2(text, value) without return types