def METHOD_NAME(self, app):
    tile = create_tmp_image((256, 256))
    container = azure_container_client(azureblob_connection(), 'tiles')
    container.upload_blob(
        name="quadkeytiles/2003.png",
        data=BytesIO(tile),
        overwrite=True
    )
    self.common_map_req.params.layers = "quadkey"
    resp = app.get(self.common_map_req)
    assert resp.content_type == "image/png"
    data = BytesIO(resp.body)
    assert is_png(data)