NullWrapper wrapper = new NullWrapper();
assert wrapper.convert(null) == null;
byte[] expected = "<null/>".getBytes();
ByteArrayOutputStream out = new ByteArrayOutputStream();
wrapper.marshal(out);
assertEquals(expected, out.toByteArray());
assert ConversionScore.compatible == wrapper.conversionScore(null);
assert ConversionScore.compatible == wrapper
.conversionScore(Object.class);