  
      def test_unique_for_date_with_nullable_date(self):
          p = FlexibleDatePost.objects.create(title="Django 1.0 is released",
              slug="Django 1.0", subtitle="Finally", posted=datetime.date(2008, 9, 3))
  
          form = FlexDatePostForm({'title': "Django 1.0 is released"})
 
</s> remove         constraint should be ignored."""
 </s> add         constraint should be ignored.
        """
        class DateTimePostForm(forms.ModelForm):
            class Meta:
                model = DateTimePost
                fields = '__all__'
 </s> remove         """If the date for unique_for_* constraints is excluded from the
 </s> add         """
        If the date for unique_for_* constraints is excluded from the </s> remove         self.assertEqual(form.is_valid(), True)
 </s> add         self.assertTrue(form.is_valid()) </s> remove         bw = BetterWriter(name='Joe Better', score=10)
        bw.save()
 </s> add     def test_modelform_subclassed_model(self):
        class BetterWriterForm(forms.ModelForm):
            class Meta:
                # BetterWriter model is a subclass of Writer with an additional `score` field
                model = BetterWriter
                fields = '__all__'

        bw = BetterWriter.objects.create(name='Joe Better', score=10) </s> remove         self.assertEqual(f.is_valid(), True)
 </s> add         self.assertTrue(f.is_valid())
        class FlexDatePostForm(forms.ModelForm):
            class Meta:
                model = FlexibleDatePost
                fields = '__all__'

  
      def test_unique_for_date_with_nullable_date(self):
        class FlexDatePostForm(forms.ModelForm):
            class Meta:
                model = FlexibleDatePost
                fields = '__all__'

          p = FlexibleDatePost.objects.create(title="Django 1.0 is released",
              slug="Django 1.0", subtitle="Finally", posted=datetime.date(2008, 9, 3))
  
          form = FlexDatePostForm({'title': "Django 1.0 is released"})
keep add keep keep keep keep
 Fixed #6103 -- Splitted tests in model_forms tests 
tests/model_forms/tests.py