code: def test_delete_no_matchno_sane_rowcount(self):
      with self.connection.begin():
          self.updater.update_to_step(_up(None, "a", True))
  
          self.updater.heads.add("x")
          with mock.patch.object(
              self.connection.dialect, "supports_sane_rowcount", False
          ):
              self.updater.update_to_step(_down("x", None, True))
  
imports: from sqlalchemy import Column
  from sqlalchemy import inspect
  from sqlalchemy import MetaData
  from sqlalchemy import String
  from sqlalchemy import Table
  from alembic import migration
  from alembic.testing import assert_raises
  from alembic.testing import assert_raises_message
  from alembic.testing import config
  from alembic.testing import eq_
  from alembic.testing import mock
  from alembic.testing.fixtures import TestBase
  from alembic.util import CommandError
label_desc: Use image node_id 17 for calling the UpdateRevTest obj's underlying member method code with example usage: obj.test_delete_no_matchno_sane_rowcount() without return types