code: def test_empty_code_cell(self):
      cc = new_code_cell()
      self.assertEqual(cc.cell_type, "code")
      self.assertEqual("code" not in cc, True)
      self.assertEqual("prompt_number" not in cc, True)
  
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 TestCell obj's underlying member method code with example usage: obj.test_empty_code_cell() without return types