Test a abstract class in Python

I created a class by using the abstract class in Python(2.7) and now I want to test this class by Nose. How to implement it technically?

Here I give an example code:

# -*- coding: utf-8 -*-
from abc import ABCMeta, abstractmethod, abstractproperty


class A(object):

    __metaclass__ = ABCMeta

    @abstractproperty
    def a(self):
        pass

    @abstractmethod
    def do(self, obj):
        pass