@Deployment
public static WebArchive deploy() {
    File[] jars = Maven.resolver().loadPomFromFile("pom.xml")
            .resolve("com.jayway.awaitility:awaitility")
            .withTransitivity().asFile();

    return ShrinkWrap.create(WebArchive.class)
            .addAsLibraries(jars)
            .addClasses(Ping.class, PingsListener.class, TimerSessionBean.class);
}

@Test
public void should_receive_two_pings() {
    await().untilCall(to(pings.getPings()).size(), equalTo(2));

    Ping firstPing = pings.getPings().get(0);
    Ping secondPing = pings.getPings().get(1);

    long delay = secondPing.getTime() - firstPing.getTime();
    System.out.println("Actual timeout = " + delay);
    assertThat(delay, is(withinWindow(TIMEOUT, TOLERANCE)));
}