def test_get_by_id_positive(self):
"""Positive test of the CustomUser.get_by_id() method"""
author = Author.get_by_id(101)
self.assertEqual(author.id, 101)
self.assertEqual(author.name, 'author1')
self.assertEqual(author.surname, "s1")
self.assertEqual(author.patronymic, "p1")
def test_get_by_id_negative(self):
"""Negative test of the CustomUser.get_by_id() method"""
author = Author.get_by_id(999)
self.assertIsNone(author)