def test_ContainedProxy_instances_have_no_instance_dictionaries():
"""Make sure that proxies do'nt have dictionnaries.
"""
class C(object):
pass
c = C()
c.x = 1
assert c.__dict__ == {'x': 1}
p = ContainedProxy(c)
assert p.__dict__ == {}
p.y = 3
assert p.__dict__ == {}
def test_basic_proxy_attribute_management_and_picklability():
"""Contained-object proxy
This is a picklable proxy that can be put around objects that
don't implement IContained.
"""
l = [1, 2, 3]
p = ContainedProxy(l)
p.__parent__ = 'Dad'
p.__name__ = 'p'
assert p == [1, 2, 3]
assert p.__parent__ == 'Dad'
assert p.__name__ == 'p'
'p'
with pytest.raises(TypeError):
# A proxy is not pickable.
pickle.loads(pickle.dumps(p))