code: def test_get_current_revision_offline(self):
      context = self.make_one(
          dialect_name="sqlite",
          opts={"starting_rev": "startrev", "as_sql": True},
      )
      eq_(context.get_current_revision(), "startrev")
  
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 14 for calling the TestMigrationContext obj's underlying member method code with example usage: obj.test_get_current_revision_offline() without return types