'Test column operations raise DBOperationNotAllowed.'

def test_column(self):

    column = sqlalchemy.Column()
    with BannedDBSchemaOperations(banned_ops={'Column': ['create', 'alter', 'drop']}):
        self.assertRaises(DBOperationNotAllowed, column.drop)
        self.assertRaises(DBOperationNotAllowed, column.alter)
        self.assertRaises(DBOperationNotAllowed, column.create)
