static UnixResolverOptions parseEtcResolverOptions() throws IOException {
        return parseEtcResolverOptions(new File(ETC_RESOLV_CONF_FILE));
    }
@Test
    public void defaultValueReturnedIfAttemptsOptionsIsNotPresent(@TempDir Path tempDir) throws IOException {
        File f = buildFile(tempDir, "search localdomain\n" +
            "nameserver 127.0.0.11\n");
        assertEquals(16, parseEtcResolverOptions(f).attempts());
    }