Generic constructor assertion

It is quite common to write such initializers:

class Foo(object):
    def __init__(self, a, b):
        self.a = a
        self.b = b

Why not test it in a generic way?

import inspect

def assert_simple_constructor(klass):
    allargs = inspect.getargspec(klass.__init__)[0]
    args = allargs[1:] # skipping self
    instance = klass(*args)
    for argname in args:
        assert hasattr(instance, argname) # skipped the message
        assert getattr(instance, argname) == argname # to keep short