@Test
public void testWeb3Sha3() throws Exception {

    web3j.web3Sha3("0x68656c6c6f20776f726c64").send();
    verifyResult(
            "{\"jsonrpc\":\"2.0\",\"method\":\"web3_sha3\","
                    + "\"params\":[\"0x68656c6c6f20776f726c64\"],\"id\":1}");
}