Puppeteer - the tests do not perform any action

so, I'm using Puppeteer with Jest. After adding

    const browser = await puppeteer.launch({ headless: false });
    const page = await browser.newPage();

My tests does not perform any actions. It doesn't matter if I'm using headless mode or let's call it "normal" mode. Anybody can help me?

homepage.test.js

const puppeteer = require('puppeteer');
const HomePage = require('./page_objects/HomePage');

const homePage = new HomePage();
describe('Homepage', () => {
  beforeAll(async () => {
    const browser = await puppeteer.launch({ headless: false });
    const page = await browser.newPage();
    await page.goto(homePage.path);
    await page.waitForSelector(homePage.loginPanel);
  });
  it('Log into your account', async () => {
    await homePage.fillLoginForm();
    await expect(page).toMatchElement(homePage.productList);
    await page.screenshot({ path: 'example.png' });
  });

HomePage.js

module.exports = class HomePage {
  constructor() {
    this.path = 'https://www.saucedemo.com/index.html';
    this.loginPanel = '#login_button_container';
    this.productList = 'div[class="inventory_container"]';
    this.loginForm = {
      fields: {
        usernameInput: 'input[id="user-name"]',
        passwordInput: 'input[id="password"]',
        logInButton: 'input[class="btn_action"]',
      },
    };
  }

  async fillLoginForm() {
    await page.type(this.loginForm.fields.usernameInput, 'standard_user');
    await page.type(this.loginForm.fields.passwordInput, 'secret_sauce');
    await page.click(this.loginForm.fields.logInButton);
  }
};