expectEvent not working with hardhat

Smart Contracts
1

Hi, I'm trying to test events from my smart contract, but seems that in not able to recognize transaction receipt object in hardhat.

This is my event:

event AccessTokenPurchased (
        string channelId,
        address indexed buyer
    );

And this is my test:

const receiptPurchase = await accessTokenManager.connect(buyer).purchase(channelId, {value: ethers.utils.parseUnits((price + buyerFee).toString(), 'ether')})

expectEvent(receiptPurchase, 'AccessTokenPurchased', {
                             channelId: channelId,
                             buyer: buyer.address
});

But I'm getting this error back:
Error: Unknown transaction receipt object

I have already imported all the required library
test.js

const {
        expectEvent, 
        expectRevert
} = require('@openzeppelin/test-helpers')

hardhat.config.js
require("@nomiclabs/hardhat-truffle5");

Can someone explain if is possible to test event with hardhat?
Thanks.