def METHOD_NAME(self):
    filename = 'wrongnamespace-mycollection-1.2.3.tar.gz'
    url = self.download_url.format(filename=filename)
    response = self.client.get(url)
    assert response.status_code == http_codes.HTTP_404_NOT_FOUND
    assert response.json() == {
        'code': 'not_found',
        'message': f'Artifact "{filename}" does not exist.',
    }