code: def test_read_empty_text_notebook(ext, tmp_path):
      if ext == ".qmd" and not is_quarto_available(min_version="0.2.0"):
          pytest.skip("quarto is not available")
      if ext in myst_extensions(no_md=True) and not is_myst_available():
          pytest.skip("MyST is not available")
  
      empty_nb = (tmp_path / "notebook").with_suffix(ext)
      empty_nb.touch()
  
      nb = jupytext.read(empty_nb)
  
      assert isinstance(nb, NotebookNode)
      assert not nb.cells
  
imports: import pytest
  from nbformat.notebooknode import NotebookNode
  import jupytext
  from jupytext.formats import NOTEBOOK_EXTENSIONS
  from jupytext.myst import is_myst_available, myst_extensions
  from jupytext.quarto import is_quarto_available
label_desc: Use image node_id 1 for calling a global function with example usage: test_read_empty_text_notebook(ext, tmp_path) without return types