@Deployment
public static WebArchive createDeployment() {
    return ShrinkWrap.create(WebArchive.class)
            .addClass(CharResponseWrapper.class)
            .addClasses(TestServlet.class, FooBarFilter.class);
}

@Test
@RunAsClient
public void filtered_servlet_should_return_enhanced_foobar_text() throws MalformedURLException {
    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(URI.create(new URL(base, "filtered/TestServlet").toExternalForm()));

    Response response = target.request().get();
    Assert.assertThat(response.readEntity(String.class), is(equalTo("foo--bar--bar")));
}

@Test
@RunAsClient
public void standard_servlet_should_return_simple_text() throws MalformedURLException {
    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(URI.create(new URL(base, "TestServlet").toExternalForm()));

    Response response = target.request().get();
    Assert.assertThat(response.readEntity(String.class), is(equalTo("bar")));
}