public static <T> ValueOnlyWindowedValueCoder<T> getValueOnlyCoder(Coder<T> valueCoder) {
    return ValueOnlyWindowedValueCoder.of(valueCoder);
  }
@Test
  public void testValueOnlyWindowedValueCoderIsSerializableWithWellKnownCoderType() {
    CoderProperties.coderSerializable(WindowedValue.getValueOnlyCoder(GlobalWindow.Coder.INSTANCE));
  }