code: def test_alter_column_autoincrement_none(self):
      m1 = MetaData()
      m2 = MetaData()
  
      Table("a", m1, Column("x", Integer, nullable=False))
      Table("a", m2, Column("x", Integer, nullable=True))
  
      ops = self._fixture(m1, m2, return_ops=True)
      assert "autoincrement" not in ops.ops[0].ops[0].kw
  
imports: from sqlalchemy import BigInteger
  from sqlalchemy import Column
  from sqlalchemy import Integer
  from sqlalchemy import MetaData
  from sqlalchemy import Table
  from sqlalchemy.testing import in_
  from ._autogen_fixtures import AutogenFixtureTest
  from ...None import testing
  from ...testing import config
  from ...testing import eq_
  from ...testing import is_
  from ...testing import TestBase
label_desc: Use image node_id 1 for calling the AutoincrementTest obj's underlying member method code with example usage: obj.test_alter_column_autoincrement_none() without return types