def METHOD_NAME(self) -> None:
    with patch("antlir.rpm.storage.s3_storage.open_url") as open_url:
        with self.storage.reader("test/prefix/1234") as _:
            pass
        open_url.assert_called_with(
            "https://antlir-test.s3-test-region.amazonaws.com/" "test/prefix/1234"
        )