code: def define_tables(cls, metadata):
      Table(
          "items",
          metadata,
          Column(
              "item_id",
              Integer,
              primary_key=True,
              test_needs_autoincrement=True,
          ),
          Column("name", String(40)),
      )
      Table(
          "item_keywords",
          metadata,
          Column("item_id", Integer, ForeignKey("items.item_id")),
          Column(
              "keyword_id", Integer, ForeignKey("keywords.keyword_id")
          ),
          Column("data", String(40)),
      )
      Table(
          "keywords",
          metadata,
          Column(
              "keyword_id",
              Integer,
              primary_key=True,
              test_needs_autoincrement=True,
          ),
          Column("name", String(40)),
      )
  
file_path: sqlalchemy/test/orm/test_association.py
imports: from sqlalchemy import ForeignKey
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import select
  from sqlalchemy import String
  from sqlalchemy.orm import relationship
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.fixtures import fixture_session
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
label_desc: Use image node_id 1 for calling the AssociationTest obj's underlying member method code with example usage: obj.define_tables(cls, metadata) without return types