from types import SimpleNamespace

import pytest

from apps.users.signals import ensure_username_on_registration


pytestmark = pytest.mark.unit


def test_missing_username_is_generated_only_for_new_account(mocker):
    user = SimpleNamespace(username="", save=mocker.Mock())
    ensure_username_on_registration(None, user, created=True)
    assert len(user.username) == 10
    user.save.assert_called_once_with(update_fields=["username"])
    user.save.reset_mock()
    ensure_username_on_registration(None, user, created=False)
    user.save.assert_not_called()