def METHOD_NAME(self):
    metadata = sqlalchemy.MetaData()
    sqlalchemy.Table(
        self.table_name, metadata,
        sqlalchemy.Column('user_id', sqlalchemy.Integer, primary_key=True),
        sqlalchemy.Column('user_name', sqlalchemy.String(16), nullable=True),
        sqlalchemy.Column('email_address', sqlalchemy.String(60), key='email'),
        sqlalchemy.Column('password', sqlalchemy.Integer, nullable=False)
    )
    self._test_diffs(metadata, {
        SimpleDiff(DiffTypes.MODIFY_TYPE, self.table_name, 'password', None),
        SimpleDiff(DiffTypes.MODIFY_NULLABLE, self.table_name, 'user_name', None),
    })