public static <T> FullWindowedValueCoder<T> getFullCoder(
      Coder<T> valueCoder, Coder<? extends BoundedWindow> windowCoder) {
    return FullWindowedValueCoder.of(valueCoder, windowCoder);
  }
@Test
  public void testFullWindowedValueCoderIsSerializableWithWellKnownCoderType() {
    CoderProperties.coderSerializable(
        WindowedValue.getFullCoder(GlobalWindow.Coder.INSTANCE, GlobalWindow.Coder.INSTANCE));
  }