code: def test_config_explicit_w_pk(self):
      context = self.make_one(
          dialect_name="sqlite", opts={"version_table_pk": True}
      )
      eq_(len(context._version.primary_key), 1)
      eq_(context._version.primary_key.name, "alembic_version_pkc")
  
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 10 for calling the TestMigrationContext obj's underlying member method code with example usage: obj.test_config_explicit_w_pk() without return types