code: def test_value_is_none_attributeerror(self):
      Base = declarative_base()
  
      class A(Base):
          __tablename__ = "a"
          id = Column("id", Integer, primary_key=True)
          array = Column("_array", ARRAY(Integer))
          first = index_property("array", 1)
  
      a = A()
      assert_raises(AttributeError, getattr, a, "first")
  
      assert_raises(AttributeError, delattr, a, "first")
  
imports: import sqlalchemy
  from sqlalchemy import inspect
  from sqlalchemy import Integer
  from sqlalchemy import testing
  from sqlalchemy import Text
  from sqlalchemy.ext.indexable import index_property
  from sqlalchemy.orm import declarative_base
  from sqlalchemy.orm import Session
  from sqlalchemy.sql.sqltypes import ARRAY
  from sqlalchemy.sql.sqltypes import JSON
  from sqlalchemy.testing import assert_raises
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing import in_
  from sqlalchemy.testing import is_
  from sqlalchemy.testing import ne_
  from sqlalchemy.testing import not_in
  from sqlalchemy.testing.entities import ComparableEntity
  from sqlalchemy.testing.schema import Column
label_desc: Use image node_id 4 for calling the IndexPropertyTest obj's underlying member method code with example usage: obj.test_value_is_none_attributeerror() without return types