@Beta
    public static Application fromBuilder(Builder builder) throws Exception {
        return builder.build();
    }
@Test
    void server() throws Exception {
        try (ApplicationFacade app = new ApplicationFacade(Application.fromBuilder(new Application.Builder().container("default", new Application.Builder.Container()
                .server("foo", MockServer.class)))
        )) {
            MockServer server = (MockServer) app.getServerById("foo");
            assertNotNull(server);
            assertTrue(server.isStarted());
        }
    }