add the file settings_dev.py to be cleaned, set cache timeout to 0 (i.e. disable cache for tests)
from django.contrib import admin
from cm.models import *
admin.site.register(Text)
admin.site.register(Role)
admin.site.register(UserProfile)
admin.site.register(UserRole)
admin.site.register(TextVersion)
admin.site.register(Email)
admin.site.register(Activity)
admin.site.register(Notification)