Django: пишу тесты и потерял созданный и сохраненный в БД объект

class PersonTest(TestCase):
 
    def create_person(self, first_name="", last_name="", patronymic_name="",
                      maiden_name="", year_of_birth=0, indicator=""):
 
        person = Person(first_name = first_name,
                        last_name = last_name,
                        patronymic_name = patronymic_name,
                        maiden_name = maiden_name,
                        year_of_birth = year_of_birth,
                        indicator=indicator)
        person.save()
 
 
    def test_0_person_str(self):
        self.create_person(first_name = "Mary",
                           last_name = "Smith",
                           patronymic_name = "Olegovna",
                           maiden_name = "Johnson",
                           year_of_birth = 1976,
                           indicator="First")        
 
        str_selected_person = str(Person.objects.all()[0])        
        str_estimated_person = "Smith (Johnson) Mary Olegovna (1976) (First)"
 
        self.assertEqual(str_selected_person, str_estimated_person)
 
    def test_1_person_model_unfilled_saves_successfully(self):        
        self.create_person()       
        selected_person = Person.objects.all()[1] # The 0th person was created
                                                  # in previous test.        
        self.assertEqual(selected_person.first_name, "")
        self.assertEqual(selected_person.last_name, "")
        self.assertEqual(selected_person.patronymic_name, "")
        self.assertEqual(selected_person.maiden_name, "")        
        self.assertEqual(selected_person.year_of_birth, 0)
        self.assertEqual(selected_person.indicator, "")

Traceback (most recent call last):
  File "/home/michael/workspace/photoarchive/photoarchive/general/tests.py", line 133, in test_6_person_model_unfilled_saves_successfully
    selected_person = Person.objects.all()[1] # The 0th person was created
  File "/home/michael/workspace/venvs/photoarchive/lib/python3.5/site-packages/django/db/models/query.py", line 297, in __getitem__
    return list(qs)[0]
IndexError: list index out of range

..........> /home/michael/workspace/photoarchive/photoarchive/general/tests.py(134)test_6_person_model_unfilled_saves_successfully()
-> selected_person = Person.objects.all()[1] # The 0th person was created
(Pdb) people = Person.objects.all()
(Pdb) people
[<Person: >]
(Pdb)