public JerseyClientBuilder using(JerseyClientConfiguration configuration) {
        this.configuration = configuration;
        apacheHttpClientBuilder.using(configuration);
        return this;
    }
@Test
    void usesACustomDnsResolver() {
        final DnsResolver customDnsResolver = new SystemDefaultDnsResolver();
        builder.using(customDnsResolver);
        verify(apacheHttpClientBuilder).using(customDnsResolver);
    }