Django can't find specific test, but runs it if module is defined

I have some tests in myproject/core/tests/test_views_front.py. When I try to run python manage.py test myproject.core.tests.test_views_front I get:

NOTE: Using test database settings!
NOTE: Logging is disabled!
Traceback (most recent call last):
  File "manage.py", line 9, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/__in
it__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/__in
it__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/comm
ands/test.py", line 50, in run_from_argv
    super(Command, self).run_from_argv(argv)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/base
.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/comm
ands/test.py", line 71, in execute
    super(Command, self).execute(*args, **options)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/base
.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/south/management/commands/t
est.py", line 8, in handle
    super(Command, self).handle(*args, **kwargs)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/comm
ands/test.py", line 88, in handle
    failures = test_runner.run_tests(test_labels)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/test/runner.py", lin
e 144, in run_tests
    suite = self.build_suite(test_labels, extra_tests)
  File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/test/runner.py", lin
e 63, in build_suite
    tests = self.test_loader.loadTestsFromName(label)
  File "/usr/lib/python2.7/unittest/loader.py", line 100, in loadTestsFromName
    parent, obj = obj, getattr(obj, part)
AttributeError: 'module' object has no attribute 'test_views_front'

This also happens if I run python manage.py test myproject.core.tests.test_views_front.FrontPageViewTests. However, if I simply run python manage.py test or python manage.py test myproject.core.tests then all the tests (including the ones in the aforementioned file) run fine. I found this solution but my test file seems to import fine, without any errors or warnings. Is there anything else I might be missing?