contentTail = new BytesArray("MNO".getBytes());
digestBlob.addContent(contentTail, true);
byte[] buffer = new byte[15];
FileInputStream stream = new FileInputStream(digestBlob.file());
stream.read(buffer, 0, 15);
assertEquals("ABCDEFGHIJKLMNO", new BytesArray(buffer).toUtf8().trim());
File file = digestBlob.commit();
assertTrue(file.exists());
file.delete();