Added explicit positions to categories to make tests pass for all databases.
Added explicit positions to categories to make tests pass for all databases.

wisonwang/django-lfs,pigletto/django-lfs,pigletto/django-lfs,wisonwang/django-lfs,leadbrick/django-lfs,baffolobill/django-lfs,diefenbach/django-lfs,diefenbach/django-lfs,leadbrick/django-lfs,baffolobill/django-lfs,leadbrick/django-lfs,pigletto/django-lfs,wisonwang/django-lfs,diefenbach/django-lfs,baffolobill/django-lfs