def METHOD_NAME(self):
    self._do_request(
        self.user,
        device_id='4',
        fcm_token='token-101'
    )
    device = CommCareUser.get(self.user.get_id).get_device('4')
    self.assertIsNone(device.fcm_token)
    self.assertIsNone(device.fcm_token_timestamp)