Foo.spec.js

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

describe.only('Foo contract', function () {
  let account;
  let accountAddress;
  let contract;

  before(async function () {
    console.info('deploying account...');
    account = await starknet.deployAccount('OpenZeppelin');
    accountAddress = BigInt(account.starknetContract.address);

    console.info('deploying contract...');
    const contractFactory = await starknet.getContractFactory('Foo');
    contract = await contractFactory.deploy();
  });

  describe('get_caller', function () {
    it('should return the caller address', async function () {
      const result = await account.call(contract, 'get_caller');
      console.info('result: ', result)
    });
  });
});