Test Runner doen't pick test cases for all apps

[aniket03]

Hi I am working on a django project and aim to find the slow running test cases. When I use django-slow-tests with --parallel option like
python manage.py test --settings=test_settings --parallel -v 2 . I find that the test runner doesn't pick up any test cases and 0 test cases are run. Although when I use:
python manage.py test --settings=test_settings -v 2 it seems to work perfectly fine. So I guess there is some gotcha here while dealing with parallel.