def METHOD_NAME(self):
    submission = SubmissionFactory.create(form=self.form)
    assert not submission.is_authenticated, "Submission must be anonymous"
    self._add_submission_to_session(submission)
    endpoint = reverse(
        "api:submission-steps-detail",
        kwargs={
            "submission_uuid": submission.uuid,
            "step_uuid": self.form.formstep_set.get().uuid,
        },
    )
    body = {"data": {"component1": "henlo"}}
    response = self.client.put(endpoint, body)
    self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)