@Deployment(testable = false)
public static WebArchive createDeployment() {
    WebArchive war = ShrinkWrap.create(WebArchive.class).
            addClass(ParentServlet.class).
            addClass(ChildServlet.class);
    return war;
}

@Test
public void testChildServlet() throws IOException, SAXException {
    try {
        webClient.getPage(base + "/ChildServlet");
    } catch (FailingHttpStatusCodeException e) {
        assertNotNull(e);
        assertEquals(404, e.getStatusCode());
        return;
    }
    fail("/ChildSevlet could be accessed with programmatic registration");
    webClient.getPage(base + "/ParentServlet");
    webClient.getPage(base + "/ChildServlet");
}