Sample code for Cypress with Page object pattern

login.spec.js

import {
    Login
  } from '../../support/login-po.js';

  var login = new Login(); 
describe('Sanity E2E Test suite for Login page ', () => {
    before('Visit Login page', () => {
        cy.visit('/login') //Visiting login page before a test run 
    })
    it('Verify if User can login', () => {
       login.getUsername().should('have.attr', 'placeholder', 'Email/Username').type('[email protected]')
       login.getPassword().should('have.attr', 'placeholder', 'Password').type('test@123')
       login.getSignupBtn().should('have.value', 'Signup')
       login.getLoginBtn().should('have.value','Login').should('not.be.disabled').click()
       login.getForgotPasswordBtn().should('have.value','Forgot Password')
    })
})