code: def test_invalid_isolation_level_type(self):
      # isolation level is a string, not an integer
      regex = "isolation_level must be str or None"
      with self.assertRaisesRegex(TypeError, regex):
          memory_database(isolation_level=123).__enter__()
  
imports: import datetime
  import unittest
  import sqlite3
  import weakref
  import functools
  from test import support
  from unittest.mock import patch
  from .util import memory_database, cx_limit
  from .util import MemoryDatabaseMixin
label_desc: Use image node_id 23 for calling the RegressionTests obj's underlying member method code with example usage: obj.test_invalid_isolation_level_type() without return types