public void testBigInteger(BigInteger v) throws Exception {
MessagePack msgpack = new JSON();
BufferPacker packer = msgpack.createBufferPacker();
packer.writeBigInteger(v);
byte[] bytes = packer.toByteArray();
Unpacker unpacker = msgpack.createUnpacker(new ByteArrayInputStream(bytes));
BigInteger ret = unpacker.readBigInteger();
assertEquals(v, ret);
}