docstr: Ensure that splitting multiline blocks is safe
docstr_tok: ["Ensure","that","splitting","multiline","blocks","is","safe"]
code: def test_roundtrip_split(self):
      """Ensure that splitting multiline blocks is safe"""
      # This won't differ from test_roundtrip unless the default changes
      s = writes(nb0, split_lines=True)
      self.assertEqual(nbjson.reads(s), nb0)
  
file_path: nbformat/tests/v3/test_json.py
imports: from __future__ import annotations
  import copy
  import json
  from base64 import decodebytes
  from unittest import TestCase
  from nbformat.v3 import nbjson
  from nbformat.v3.nbbase import from_dict
  from nbformat.v3.nbjson import writes
  from .None import formattest
  from .nbexamples import nb0
label_desc: Use image node_id 2 for calling the TestJSON obj's underlying member method code with example usage: obj.test_roundtrip_split() without return types