public static byte[] encode(RawTransaction rawTransaction) {
        return encode(rawTransaction, null);
    }
@Test
    public void testEip155Encode() {
        assertArrayEquals(
                TransactionEncoder.encode(createEip155RawTransaction(), (byte) 1),
                (Numeric.hexStringToByteArray(
                        "0xec098504a817c800825208943535353535353535353535353535353535353535880de0"
                                + "b6b3a764000080018080")));
    }