Pytest не вызывает ошибку ValidationError

Я пытаюсь проверить, что пользователь не может быть одновременно агентом и организатором, но pytest не выдает ValidationError.

models.py

class User(AbstractUser):
    email = models.EmailField(unique=True)
    is_organizer = models.BooleanField(default=False)
    is_agent = models.BooleanField(default=False, )

    def clean(self):
        super().clean()
        if self.is_organizer and self.is_agent:
            raise ValidationError("User can't be Agent and Organizer at the same time")

test

@pytest.mark.django_db()
def test_user_cant_be_organizer_and_agent_at_the_same_time():
    # user = User(username='ali', email='ali@gmail.com', password='a.123456', is_agent=False, is_organizer=True)
    # user.full_clean()
    with pytest.raises(ValidationError):
        User(username='a', email='a@gmail.com', password='a.123456', is_agent=True, is_organizer=True)

pytest error

core\tests\test_users.py:21 (test_user_cant_be_organizer_and_agent_at_the_same_time)
@pytest.mark.django_db()
    def test_user_cant_be_organizer_and_agent_at_the_same_time():
        # user = User(username='ali', email='ali@gmail.com', password='a.123456', is_agent=False, is_organizer=True)
        # user.full_clean()
        with pytest.raises(ValidationError):
>           User(username='a', email='a@gmail.com', password='a.123456', is_agent=True, is_organizer=True)
E           Failed: DID NOT RAISE <class 'django.core.exceptions.ValidationError'>

test_users.py:28: Failed
Destroying test database for alias 'default' ('test_crm')...

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