def METHOD_NAME(self):
    self.user = SuperUserFactory.create()
    self.client.force_authenticate(user=self.user)
    url = reverse("api:form-list")
    data = {
        "name": "Test Post Form",
        "slug": "test-post-form",
        "registrationBackends": [
            {
                "key": "email1",
                "name": "Email",
                "backend": "email",
                "options": {
                    "attachFilesToEmail": None,
                    "emailSubject": "Invalid template {{ _name }}",
                    "toEmails": ["test@email.nl"],
                },
            }
        ],
    }
    response = self.client.post(url, data=data)
    self.assertEqual(status.HTTP_400_BAD_REQUEST, response.status_code)
    error = response.json()
    self.assertEqual(
        error["invalidParams"][0]["name"],
        "registrationBackends.0.options.emailSubject",
    )
    self.assertEqual(error["invalidParams"][0]["code"], "syntax_error")