code: def tearDown(self):
      in_t = getattr(self.connection, "in_transaction", lambda: False)
      if in_t():
          self.connection.rollback()
      with self.connection.begin():
          version_table.drop(self.connection, checkfirst=True)
      self.connection.close()
  
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 3 for calling the UpdateRevTest obj's underlying member method code with example usage: obj.tearDown() without return types