public JerseyClientBuilder using(JerseyClientConfiguration configuration) {
        this.configuration = configuration;
        apacheHttpClientBuilder.using(configuration);
        return this;
    }
@Test
    void usesACustomCredentialsProvider() {
        CredentialsStore customCredentialsProvider = new SystemDefaultCredentialsProvider();
        builder.using(customCredentialsProvider);
        verify(apacheHttpClientBuilder).using(customCredentialsProvider);
    }