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As noted in the comment, Django 1.6 introduced backwards-incompatibility with discovery of tests in any test module.
Before Django 1.6, one would have to do the following:
Create file named __init__.py
in
forum/tests/__init__.py
And import all test from other moduls inside it.
from test_views import SomeTestCase
from test_models import SomeOtherTestCase
Source:stackexchange.com