def test_created_at_defaults_to_datetime(self):
user = User(username='******', email='*****@*****.**')
user.save()
assert bool(user.created_at)
assert isinstance(user.created_at, dt.datetime)
def test_password_is_nullable(self):
user = User(username='******', email='*****@*****.**')
user.save()
assert user.password is None
def test_get_by_id(self):
user = User(username='******', email='*****@*****.**')
user.save()
retrieved = User.get_by_id(user.id)
assert retrieved == user