Fixed #18508 -- tests for repeated deletion bug in ModelFormSet

        formset.save()

        self.assertEqual(Poet.objects.count(), 0)

    def test_outdated_deletion(self):

        poet = Poet.objects.create(name='test')

        poem = Poem.objects.create(name='Brevity is the soul of wit', poet=poet)

        PoemFormSet = inlineformset_factory(Poet, Poem, fields="__all__", can_delete=True)

        # Simulate deletion of an object that doesn't exist in the database

        data = {

            'form-TOTAL_FORMS': '2',

            'form-INITIAL_FORMS': '2',

            'form-0-id': str(poem.pk),

            'form-0-name': 'foo',

            'form-1-id': str(poem.pk + 1),  # doesn't exist

            'form-1-name': 'bar',

            'form-1-DELETE': 'on',

        }

        formset = PoemFormSet(data, instance=poet, prefix="form")

        # The formset is valid even though poem.pk + 1 doesn't exist,

        # because it's marked for deletion anyway

        self.assertTrue(formset.is_valid())

        formset.save()

        # Make sure the save went through correctly

        self.assertEqual(Poem.objects.get(pk=poem.pk).name, "foo")

        self.assertEqual(poet.poem_set.count(), 1)

        self.assertFalse(Poem.objects.filter(pk=poem.pk + 1).exists())

class ModelFormsetTest(TestCase):

    def test_simple_save(self):

        qs = Author.objects.all()