To get event args when I using ethers.js

Question

I'm a three months old programmer. So if what I'm saying is ambiguous, please let me know and help me being a better programmer.

Now I'm coding a test code as using hardhat and ether.js.

My solidity contract is about orderbook token exchange. When people make an order, the contract emit specific event named "Make".

---

event Make(
    bytes32 indexed orderId, 
    address indexed maker,
    address makerToken, 
    address takerToken,
    uint256 amountSell,
    uint256 amountBuy
);

---

orderId is made by hashing some data.

And I want to check if event is emitted correctly. While coding test codes, I've spent quite a long time to know how to get emitted events.

finally I can get events using code below. but what I really want is

1. get 1st arg of event and put it a var. (in case, bytes32 hash) looks like, const hash = await events.args[0];

2. compare 2nd arg of event and compare it with value. (in case, address maker) looks like, expect(await events.args[1]).to.equal(add1.address);

actually it's not a two question. just one.

here's my test code.

const { expect } = require("chai");
const { ethers } = require("hardhat");

describe("EX contract", function () {
    let EX, ex, token, Token, add0, add1, add2, add3;

    before(async function () {
      EX = await ethers.getContractFactory("EX");
      Token = await ethers.getContractFactory("Token");
      ex = await EX.deploy(1000);
      token = await Token.deploy();
      [add0, add1, add2, add3] = await ethers.getSigners();
    });
  
    beforeEach(async function () {
      await token.mint(add1.address, 200000);
    });

    describe("Make / Take order", function () {
        await ex.connect(add1).makeOrder(token.address, 100, {value : 100});
        await ex.connect(add1).makeOrder(token.address, 100, {value : 200});
        
        let eventFilter = ex.filters.Make();
        let events = await ex.queryFilter(eventFilter, "latest");

        console.log(events);            //"events" contains too many information.
    });
});

Help me please, mates!

Answer 1

I suggest to try OpenZeppelin test helpers. They have a check expectEvent that reads events from the transaction's receipt.

In your case it should look like

it("Make / Take order", async function () {
  const receipt = await ex.connect(add1).makeOrder(token.address, 100, {value : 100});

  expectEvent(receipt, 'Make', {
    orderId: '<EXPECTED_ORDER_ID>',
    maker: '<EXPECTED_MAKER>',
  });
});

Answer 2

Thanks Ismael!

I solved it as two different way. one from my code and one from your help.

from my code

    await ex.makeOrder(token.address, 100, {value : 200});

    const eventFilter = ex.filters.Make();
    const events = await ex.queryFilter(eventFilter, "latest");
    const hash = events[0].args[0];

and from your help

    const tx = await ex.makeOrder(token.address, 100, {value : 200});
    const res = await tx.wait();
    const hash = res.events[0].args[0];

I really appreciate it! :)