public static <V> TimestampedValue<V> of(V value, Instant timestamp) {
    return new TimestampedValue<>(value, timestamp);
  }
@Test
  public void testCoderEncodeDecodeEquals() throws Exception {
    CoderProperties.coderDecodeEncodeEqual(
        CODER, TimestampedValue.of(GlobalWindow.INSTANCE, Instant.now()));
  }