gen.close();
byte[] r = baos.toByteArray();
ByteArrayInputStream bais = new ByteArrayInputStream(r);
BSONDecoder decoder = new BasicBSONDecoder();
BSONObject obj = decoder.readObject(bais);
byte[] o = (byte[])obj.get("Test");
assertEquals(2, o.length);
assertEquals((byte)1, o[0]);
assertEquals((byte)2, o[1]);
}