Working with time using hardhat returns Error: Invalid JSON RPC response: ""

[invissiblecat]

I asked about this issue at stackoverflow, but didn't get an answer. As I am not sure, if there is a problem from my side or a real issue, I guess it is okay to ask here (tell me if it is wrong).

Following the examples, I try to increase time in my test and keep getting an error: Invalid JSON RPC response: ""

Test with given error:

it("should revert claim drawing with 'Android: bad state'", async () => {

        const [owner, signer1] = await ethers.getSigners();

        let duration = time.duration.seconds(3);

        await time.increase(duration);

        await android.claimPainting(1);

        await truffleAssert.reverts(
		android.claimPainting(1),
		'Android: bad state'
	 );
    });

Error message:

11) Start drawing
       should revert claim drawing with 'Android: bad state':
     Error: Invalid JSON RPC response: ""
      at Object.InvalidResponse (node_modules/web3-core-helpers/lib/errors.js:43:16)
      at XMLHttpRequest.request.onreadystatechange (node_modules/web3-providers-http/lib/index.js:95:32)
      at XMLHttpRequestEventTarget.dispatchEvent (node_modules/xhr2-cookies/xml-http-request-event-target.ts:44:13)
      at XMLHttpRequest._setReadyState (node_modules/xhr2-cookies/xml-http-request.ts:219:8)
      at XMLHttpRequest._onHttpRequestError (node_modules/xhr2-cookies/xml-http-request.ts:379:8)
      at ClientRequest.<anonymous> (node_modules/xhr2-cookies/xml-http-request.ts:266:37)
      at ClientRequest.emit (node:events:390:28)
      at ClientRequest.emit (node:domain:475:12)
      at Socket.socketErrorListener (node:_http_client:447:9)
      at Socket.emit (node:events:390:28)
      at Socket.emit (node:domain:475:12)
      at emitErrorNT (node:internal/streams/destroy:157:8)
      at emitErrorCloseNT (node:internal/streams/destroy:122:3)
      at processTicksAndRejections (node:internal/process/task_queues:83:21)

Hardhat config file:

import * as dotenv from "dotenv";

import { HardhatUserConfig, task } from "hardhat/config";
import "@nomiclabs/hardhat-etherscan";
import "@nomiclabs/hardhat-waffle";
import "@typechain/hardhat";
import "hardhat-gas-reporter";
import "solidity-coverage";
import "@openzeppelin/test-helpers";
const fs = require("fs");

dotenv.config();

const { apiKey, privateKey } = JSON.parse(fs.readFileSync("./keys.json", 'utf8'));

task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners();

  for (const account of accounts) {
    console.log(account.address);
  }
});

const config: HardhatUserConfig = {
  solidity: {
    version: "0.8.4",
    settings: {
      optimizer: {
        enabled: true,
        runs: 200
      }
    }
  },
  networks: {
    ropsten: {
      url: process.env.ROPSTEN_URL || "",
      accounts:
        process.env.PRIVATE_KEY !== undefined ? [process.env.PRIVATE_KEY] : [],
    },
    rinkeby: {
      url: `https://eth-rinkeby.alchemyapi.io/v2/${apiKey}`,
      // gasPrice: 225000000000,
      accounts: [
        `${privateKey}`
      ],
    },
  },
  gasReporter: {
    enabled: process.env.REPORT_GAS !== undefined,
    currency: "USD",
  },
  etherscan: {
    apiKey: process.env.ETHERSCAN_API_KEY,
  },
};

export default config;

[dalechyn]

same with truffle

[zikyfranky]

Same issue with truffle

Mine was working perfectly, then I moved the file (deleting the node_modules) folder, and after installing dependencies with yarn and npm, I get the invalid JSON Response.

Nothing's changed except the node_modules

[zikyfranky]

After digging through the libraries, I realized the error is raised when a wrong HTTP provider rpc URL is passed, so I dug deeper, and in @openzeppelin/test-helpers/src/config/web3.js there's a setDefaultWeb3Provider and apparently, this function isn't detecting the truffle injected web3, thus making use of the default http://localhost:8545 rpc URL which isn't running.

I'll update this if I figure a way to pass down the injected web3 object to @OpenZeppelin

[UPDATE]
I couldn't find a fix for this, I had to switch from truffle to hardhat.

Make sure to install @nomiclabs/hardhat-web3 and import it in your hardhat config, details here

[marc-aurele-besner]

The issue seems to be because we are using ethers.js instead of web3.js

[russanto]

Same issue with Truffle+Web3js+Ganche and setting the provider with

require('@openzeppelin/test-helpers/configure')({
    provider: 'http://127.0.0.1:7545',
});

solved the problem for me, if it can help.

[ferdasonmez]

I am having the same problem for hardhat testing environment without Ganache. How should I fix this ?