django.contrib.sites.tests contains the following test checking that the get_current method throws an exception if the current record doesn't exist:
>>> s = Site.objects.get_current()
...
>>> s.delete()
>>> Site.objects.get_current()
Traceback (most recent call last):
...
DoesNotExist: Site matching query does not exist.
"""
The problem is that the default Site record (added when the table is created) is deleted by this doctest. This creates an inconsistency when running "./manage.py test" as any test cases run before the contrib.sites test case will have a valid current_site() while those that run after won't. This can be even more confusing for someone creating test cases as running tests for an individual app ("./manage.py test myapp") may work fine while running test cases for all apps could fail (once this sites doctest gets thrown into the mix).
Proposal: Restore the default Site record at the end of the sites doctest so that other test cases can assume the record will be there (as the sites, auth, and possibly other contrib tests already do).