def METHOD_NAME(client, datalayer, map):
    root = datalayer.storage_root()
    name = "%s_1440924889.geojson" % datalayer.pk
    datalayer.geojson.storage.save("%s/%s" % (root, name), ContentFile("{}"))
    url = reverse("datalayer_version", args=(datalayer.pk, name))
    assert client.get(url).content.decode() == "{}"