public static NeverTrigger ever() {
    // NeverTrigger ignores all inputs and is Window-type independent.
    return new NeverTrigger();
  }
@Test
  public void testFireDeadline() throws Exception {
    assertEquals(
        BoundedWindow.TIMESTAMP_MAX_VALUE,
        Never.ever()
            .getWatermarkThatGuaranteesFiring(new IntervalWindow(new Instant(0), new Instant(10))));
  }