      title = models.CharField(max_length=100)
      content = models.TextField()
      posted = models.DateField(default=datetime.date.today)
  
      def awesomeness_level(self):
          return "Very awesome."
  
  class PostAdmin(admin.ModelAdmin):
 
</s> remove         self.assertEqual(display_value, EMPTY_CHANGELIST_VALUE)
 </s> add         expected = u'<img src="%simg/admin/icon-unknown.gif" alt="None" />' % settings.ADMIN_MEDIA_PREFIX
        self.assertEqual(display_value, expected)
    public = models.NullBooleanField()
      title = models.CharField(max_length=100)
      content = models.TextField()
      posted = models.DateField(default=datetime.date.today)
    public = models.NullBooleanField()
  
      def awesomeness_level(self):
          return "Very awesome."
  
  class PostAdmin(admin.ModelAdmin):
keep keep add keep keep keep keep keep
 Ensure that NullBooleanField displays the appropriate icon for null values in admin changelists. Refs #13071.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12746 bcc190cf-cafb-0310-a4f2-bffc1f526a37 
tests/regressiontests/admin_views/models.py