类的Python装饰器

我试着这样做:

import unittest

def decorator(cls):
    class Decorator(cls):
        def __init__(self, *args, **kwargs):
            super(Decorator, self).__init__(*args, **kwargs)

    return Decorator

@decorator
class myClass(unittest.TestCase):
    def __init__(self, *args, **kwargs):
        super(myClass, self).__init__(*args, **kwargs)
        self.test = 'test'

    def test_test(self):
        pass


myClass().run()

但我得到了递归MyClass.__init__.有什么方法可以避免这种情况吗？