How do I send transactions to RSK deployed smart contract functions via Ethers.js and Hardhat

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I have followed this Hardhat tutorial and trying to test a demo smart contract on RSK regtest blockchain.

Here is the hardhat.config.js setup I am using:

require('@nomiclabs/hardhat-waffle');

module.exports = {
  solidity: '0.7.3',
  defaultNetwork: 'rskregtest',
  networks: {
    hardhat: {},
    rskregtest: {
      url: 'http://localhost:4444',
    },
};

This is the test I am trying to perform:

const { expect } = require('chai');

describe('Transactions', () => {
  it('Should transfer tokens between accounts', async () => {
    const signers = await ethers.getSigners();
    const [owner, addr1] = signers;
    const Token = await ethers.getContractFactory('Token');
    const hardhatToken = await Token.deploy();
      
    console.log('Before transction');
    console.log('Owner balance: ', await hardhatToken.balanceOf(owner.address));
    console.log('Addr1 balance: ', await hardhatToken.balanceOf(addr1.address));

    // Transfer 50 tokens from owner to addr1
    await hardhatToken.connect(owner).transfer(addr1.address, 50);

    console.log('After transaction');
    console.log('Owner balance: ', await hardhatToken.balanceOf(owner.address));
    console.log('Addr1 balance: ', await hardhatToken.balanceOf(addr1.address));
      
    expect(await hardhatToken.balanceOf(addr1.address)).to.equal(50);
  });
});

I expect this test to pass, with the "owner balance" to be 999950 (total supply 1000000 minus 50) and the "address1 balance" to be 50.

However the test fails with the console output:

Before transction
Owner balance:  BigNumber { value: "1000000" }
Addr1 balance:  BigNumber { value: "0" }
After transction
Owner balance:  BigNumber { value: "1000000" }
Addr1 balance:  BigNumber { value: "0" }

Looks like the transfer transaction is being rejected and the tokens have not been transferred.

What am I doing wrong? How can I transfer RSK regtest deployed tokens from one account to another using Ethers.js and Hardhat?

ethers.js rsk solidity
1 Answers

Your transaction is eventually being processed (not rejected). However, in your code you start querying the balances before waiting for the transaction to finalize.

First you need to send a transaction request and then wait() for the response. After receiving the response you can end up querying the balances.

const txResponse = await hardhatToken
      .connect(owner)
      .transfer(addr1.address, 50);
await txResponse.wait();

console.log('After transaction');
console.log('Owner balance: ', await hardhatToken.balanceOf(owner.address));

Ref: TransactionResponse.wait() in ethers.js docs

user_166953410
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