@Test
public void itCanDecryptIt() throws Exception {
final byte[] originalBody = "I am a secret document".getBytes();
final MessageWriter writer = new MessageWriter(ownerKeySet.unlock("test".toCharArray()), ImmutableList.of(recipientKeySet), new SecureRandom());
final byte[] encryptedBody = writer.write(originalBody);
final Field bodyField = doc.getClass().getDeclaredField("body");
bodyField.setAccessible(true);
bodyField.set(doc, encryptedBody);