          f.queryset = Category.objects.all()
          f.label_from_instance = lambda obj: "category " + str(obj)
          self.assertEqual(list(f.choices), [
              ('', '---------'),
              (c1.pk, 'category Entertainment'),
              (c2.pk, "category It's a test"),
              (c3.pk, 'category Third'),
              (c4.pk, 'category Fourth')])
  
          # ModelMultipleChoiceField ####################################################
  
          f = forms.ModelMultipleChoiceField(Category.objects.all())
          self.assertEqual(list(f.choices), [
              (c1.pk, 'Entertainment'),
              (c2.pk, "It's a test"),
 
</s> remove             (c1.pk, 'multicategory Entertainment'),
            (c2.pk, "multicategory It's a test"),
            (c3.pk, 'multicategory Third'),
            (c4.pk, 'multicategory Fourth')])
 </s> add             (self.c1.pk, 'multicategory Entertainment'),
            (self.c2.pk, "multicategory It's a test"),
            (self.c3.pk, 'multicategory Third')]) </s> remove             (c1.pk, 'Entertainment'),
            (c2.pk, "It's a test"),
            (c3.pk, 'Third')])
 </s> add             (self.c1.pk, 'Entertainment'),
            (self.c2.pk, "It's a test")]) </s> remove             f.clean([str(c3.id), str(c4.id)])
 </s> add             f.clean([str(self.c2.id), str(self.c3.id)]) </s> remove             (c1.pk, 'Entertainment'),
            (c2.pk, "It's a test"),
            (c3.pk, 'Third'),
            (c4.pk, 'Fourth')])
 </s> add             (self.c1.pk, 'Entertainment'),
            (self.c2.pk, "It's a test"),
            (self.c3.pk, 'Third')])
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
          f.queryset = Category.objects.all()
          f.label_from_instance = lambda obj: "category " + str(obj)
          self.assertEqual(list(f.choices), [
              ('', '---------'),
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
            (self.c1.pk, 'category Entertainment'),
            (self.c2.pk, "category It's a test"),
            (self.c3.pk, 'category Third')])
  
          f = forms.ModelMultipleChoiceField(Category.objects.all())
          self.assertEqual(list(f.choices), [
              (c1.pk, 'Entertainment'),
              (c2.pk, "It's a test"),
keep keep keep keep replace replace replace replace replace replace keep keep keep keep keep
 Fixed #6103 -- Splitted tests in model_forms tests 
tests/model_forms/tests.py