Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.26+commit.8a97fa7a.js&optimize=false&runs=200&gist=

tests...Ballot_test.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "hardhat/console.sol";
import "../contracts/3_Ballot.sol";

contract BallotTest {

    bytes32[] proposalNames;

    Ballot ballotToTest;
    function beforeAll () public {
        proposalNames.push(bytes32("candidate1"));
        ballotToTest = new Ballot(proposalNames);
    }

    function checkWinningProposal () public {
        console.log("Running checkWinningProposal");
        ballotToTest.vote(0);
        Assert.equal(ballotToTest.winningProposal(), uint(0), "proposal at index 0 should be the winning proposal");
        Assert.equal(ballotToTest.winnerName(), bytes32("candidate1"), "candidate1 should be the winner name");
    }

    function checkWinninProposalWithReturnValue () public view returns (bool) {
        return ballotToTest.winningProposal() == 0;
    }
}

tests...storage.test.js

/* eslint-disable no-undef */
// Right click on the script name and hit "Run" to execute
const { expect } = require("chai");
const { ethers } = require("hardhat");

describe("Storage", function () {
  it("test initial value", async function () {
    const Storage = await ethers.getContractFactory("Storage");
    const storage = await Storage.deploy();
    await storage.deployed();
    console.log("storage deployed at:" + storage.address);
    expect((await storage.retrieve()).toNumber()).to.equal(0);
  });
  it("test updating and retrieving updated value", async function () {
    const Storage = await ethers.getContractFactory("Storage");
    const storage = await Storage.deploy();
    await storage.deployed();
    const storage2 = await ethers.getContractAt("Storage", storage.address);
    const setValue = await storage2.store(56);
    await setValue.wait();
    expect((await storage2.retrieve()).toNumber()).to.equal(56);
  });
});