public T send() throws IOException {
        return web3jService.send(this, responseType);
    }
@Test
    public void testEthEstimateGas() throws Exception {
        web3j.ethEstimateGas(
                        Transaction.createEthCallTransaction(
                                "0xa70e8dd61c5d32be8058bb8eb970870f07233155",
                                "0x52b93c80364dc2dd4444c146d73b9836bbbb2b3f",
                                "0x0"))
                .send();

        verifyResult(
                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_estimateGas\","
                        + "\"params\":[{\"from\":\"0xa70e8dd61c5d32be8058bb8eb970870f07233155\","
                        + "\"to\":\"0x52b93c80364dc2dd4444c146d73b9836bbbb2b3f\",\"data\":\"0x0\"}],"
                        + "\"id\":1}");
    }