def METHOD_NAME(self):
    instance = ConfirmationEmailTemplateFactory.create(
        subject_nl="Foo",
        subject_en="Bar",
        content_nl="Welkom vriendjes en vriendinnetjes",
        content_en="This is fine",
    )
    serializer = ConfirmationEmailTemplateSerializer(
        instance=instance,
        data={
            "translations": {
                "nl": {
                    "subject": "Nederlands",
                    "content": "NL: {% appointment_information %} {% payment_information %} {% cosign_information %}",
                },
                "en": {
                    "subject": "English",
                    "content": "EN: {% appointment_information %} {% payment_information %} {% cosign_information %}",
                },
            }
        },
    )
    with self.subTest("Serializer validation"):
        is_valid = serializer.is_valid()
        self.assertTrue(is_valid)
    with self.subTest("Serializer saving"):
        serializer.save()
        instance.refresh_from_db()
        self.assertEqual(instance.subject_nl, "Nederlands")
        self.assertEqual(instance.subject_en, "English")
        self.assertEqual(
            instance.content_nl,
            "NL: {% appointment_information %} {% payment_information %} {% cosign_information %}",
        )
        self.assertEqual(
            instance.content_en,
            "EN: {% appointment_information %} {% payment_information %} {% cosign_information %}",
        )