public static FromEndOfWindow pastEndOfWindow() {
    return new FromEndOfWindow();
  }
@Test
  public void testEarlyFiringsToString() {
    Trigger trigger = AfterWatermark.pastEndOfWindow().withEarlyFirings(StubTrigger.named("t1"));

    assertEquals("AfterWatermark.pastEndOfWindow().withEarlyFirings(t1)", trigger.toString());
  }