code: def test_empty_notebook(self):
      nb = new_notebook()
      self.assertEqual(nb.cells, [])
  
file_path: nbformat/tests/v1/test_nbbase.py
imports: from __future__ import annotations
  from unittest import TestCase
  from nbformat.v1.nbbase import new_code_cell, new_notebook, new_text_cell
label_desc: Use image node_id 1 for calling the TestNotebook obj's underlying member method code with example usage: obj.test_empty_notebook() without return types