code: def test_update_no_match(self):
      with self.connection.begin():
          self.updater.update_to_step(_up(None, "a", True))
          self.updater.heads.add("x")
          assert_raises_message(
              CommandError,
              "Online migration expected to match one row when updating "
              "'x' to 'b' in 'version_table'; 0 found",
              self.updater.update_to_step,
              _up("x", "b"),
          )
  
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 12 for calling the UpdateRevTest obj's underlying member method code with example usage: obj.test_update_no_match() without return types