django-mailbox test errors

gistfile1.txt

(venv) di-erz@worklap:~/projects/opensource/django-mailbox$ tox
GLOB sdist-make: /home/di-erz/projects/opensource/django-mailbox/setup.py
ERROR: invocation failed (exit code 1), logfile: /home/di-erz/projects/opensource/django-mailbox/.tox/log/tox-0.log
ERROR: actionid: tox
msg: packaging
cmdargs: ['/usr/bin/python3', local('/home/di-erz/projects/opensource/django-mailbox/setup.py'), 'sdist', '--formats=zip', '--dist-dir', local('/home/di-erz/projects/opensource/django-mailbox/.tox/dist')]
env: None

Traceback (most recent call last):
  File "setup.py", line 9, in <module>
    from django.core import management
ImportError: No module named 'django'

ERROR: FAIL could not package project - v = InvocationError('/usr/bin/python3 /home/di-erz/projects/opensource/django-mailbox/setup.py sdist --formats=zip --dist-dir /home/di-erz/projects/opensource/django-mailbox/.tox/dist (see /home/di-erz/projects/opensource/django-mailbox/.tox/log/tox-0.log)', 1)