Python 3.4 setuptools namespace setup does not work - namespaces

Question

I am trying to create namespace packages for a modular project.
The core system has the following packages
homie
homie.api
homie.events
homie.mods
I want to install the respective modules as sub-packages of homie.mods.
Therefor I provided the respective homie.__init__.py and homie.mods.__init__.py with the following content:
from pkg_resources import declare_namespace
declare_namespace(__name__)
My testing module is structured as follows:
homie
homie/__init__.py
homie/mods
homie/mods/__init__.py
homie/mods/test
homie/mods/test/__init__.py
Where homie/__init__.py and homie/mods/__init__.py contain:
from pkgutil import extend_path
__path__ = extend_path(__path__, __name__)
and homie/mods/test/__init__.py contains
print('Works!')
The core package is being set up with the following setup.py:
from setuptools import setup
<snip>
setup(
name='homie',
version=version,
author=author,
author_email=author_email,
install_requires=[
'docopt',
'setproctitle',
'homeinfo',
'homeinfo-crm',
'openimmo',
'zmq'
],
packages=[
'homie',
'homie.api',
'homie.events',
'homie.mods'
],
namespace_packages=['homie', 'homie.mods'],
<snip>
which I install first.
Sencondly I install the module using its setup.py:
#! /usr/bin/env python3
from setuptools import setup
setup(name='homie-test',
version=version,
author=author,
author_email=email,
install_requires=['homie'],
packages=['homie.mods.test'],
namespace_packages=['homie', 'homie.mods'],
license=open('LICENSE.txt').read()
)
When trying to import stuff, I get the following:
>>> from homie import api, events, mods
>>> from homie.mods import test
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: cannot import name 'test'
>>>
What am I missing?