'No fields passed to modelformset_factory should result in no fields on returned forms except for the id. See #14119.'

def test_empty_fields_on_modelformset(self):

    UserFormSet = modelformset_factory(User, fields=())
    formset = UserFormSet()
    for form in formset.forms:
        self.assertTrue((u'id' in form.fields))
        self.assertEqual(len(form.fields), 1)
