VRFCoordinatorV2Mock's fulfillRandomWords not being called in hardhat local deployment - ethereum

Question

I'm building a smart contract that generates 3 random numbers using Chainlink VRF. My contract (SlotMachine.sol) implements the VRFConsumerBaseV2 and the constructor has 2 parameters: _subscriptionId and _vrfCoordinator:
constructor(
uint64 _subscriptionId,
address _vrfCoordinator
) payable VRFConsumerBaseV2(_vrfCoordinator)
I have a play() function which calls the requestRandonWords through the vrfCoordinator and I overrided the fulfillRandomWord function to use the generated random words.
I want to do 2 things: 1) create the unit tests in slotmachine.js and 2) test my contract in the hardhat network (chainId = 31337) through deploy.js
For this I'm using the VRFCoordinatorV2Mock which helps me mock an oracle's behavior (as I understand).
My unit tests in slotmachine.js are working well. The fulfillRandomWords is called and then my tests are passing. However when I add a similar logic to the deploy.js file (deploy the mock contract and then the slot machine contract) the fulfillRandomWords is not being called when I call the play() function (which has the requestRandomWords inside it) from my deployed contract.
slotmachine.js
const { ethers } = require("hardhat");
const { expect } = require("chai");
const { BigNumber } = require("ethers");
const provider = ethers.getDefaultProvider();
describe("Decentralized Slot Machine", async function () {
let myContract;
let hardhatVrfCoordinatorV2Mock;
describe("Testing Decentralized Slot Machine", function () {
//1. Contract deployment
it("Should deploy Slot Machine Contract", async function () {
const SlotMachine = await ethers.getContractFactory("SlotMachine");
let vrfCoordinatorV2Mock = await ethers.getContractFactory(
"VRFCoordinatorV2Mock"
);
hardhatVrfCoordinatorV2Mock = await vrfCoordinatorV2Mock.deploy(0, 0);
await hardhatVrfCoordinatorV2Mock.createSubscription();
await hardhatVrfCoordinatorV2Mock.fundSubscription(
1,
ethers.utils.parseEther("7")
);
myContract = await SlotMachine.deploy(
1,
hardhatVrfCoordinatorV2Mock.address,
{
value: ethers.utils.parseEther("100"),
}
);
await hardhatVrfCoordinatorV2Mock.addConsumer(1, myContract.address);
});
//2. Play
describe("First Play - First Player", function () {
it("Contract should receive random numbers", async () => {
const [account1, account2] = await ethers.getSigners();
let tx = await myContract.play(ethers.constants.AddressZero, {
value: ethers.utils.parseEther("1"),
});
let { events } = await tx.wait();
let [reqId] = events.filter((x) => x.event === "RequestedRandomness")[0]
.args;
await expect(
hardhatVrfCoordinatorV2Mock.fulfillRandomWords(
reqId,
myContract.address
)
).to.emit(myContract, "ReceivedRandomness");
let round = await myContract.rounds(reqId);
expect(round.userAddress).to.be.equal(account1.address);
expect(round.number1).to.be.equal(1);
expect(round.number2).to.be.equal(9);
expect(round.number3).to.be.equal(6);
});
});
});
});
deploy.js
const { ethers } = require("hardhat");
const localChainId = "31337";
module.exports = async ({ getNamedAccounts, deployments, getChainId }) => {
const { deploy } = deployments;
const { deployer } = await getNamedAccounts();
const chainId = await getChainId();
await deploy("VRFCoordinatorV2Mock", {
from: deployer,
args: [0, 0],
log: true,
waitConfirmations: 5,
});
const hardhatVrfCoordinatorV2Mock = await ethers.getContract(
"VRFCoordinatorV2Mock",
deployer
);
await hardhatVrfCoordinatorV2Mock.createSubscription();
await hardhatVrfCoordinatorV2Mock.fundSubscription(
1,
ethers.utils.parseEther("7")
);
const myContract = await deploy("SlotMachine", {
from: deployer,
args: [1, hardhatVrfCoordinatorV2Mock.address],
log: true,
waitConfirmations: 5,
});
await hardhatVrfCoordinatorV2Mock.addConsumer(1, myContract.address);
console.log("Contract address: ", myContract.address);
};
module.exports.tags = ["SlotMachine"];
Question
Can I deploy my contract in the hardhat network with the expected behavior of the VRFCoordinatorV2Mock which is to call automatically fulfillRandomWords? If so, how can I do this? What do I have to change in my code? If the answer is no, is there another alternative than deploying to a testnet?