Fixed #13108 -- Corrected an ambiguity in test data with the potential to...

Fixed #13108 -- Corrected an ambiguity in test data with the potential to cause test failures out of the box. Thanks to benreynwar for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12778 bcc190cf-cafb-0310-a4f2-bffc1f526a37