def test_activation_email_is_html_by_default(self):
        new_user = UserModel().objects.create_user(**self.user_info)
        profile = RegistrationProfile.objects.create_profile(new_user)
        profile.send_activation_email(Site.objects.get_current())

        self.assertEqual(len(mail.outbox[0].alternatives), 1)
``RegistrationProfile.send_activation_email`` sends an html
dataset/ETHPy150Open macropin/django-registration/registration/tests/models.py/RegistrationModelTests.test_activation_email_is_html_by_default