Mocha Test Login Page to Other Page with using beforeEach

I'm beginner for testing frontend. This is why thank you for your all suggestions. My question and problem is when i tested other page , i think i need to check beforeEach : login is success or not . But i do not have any clue for this issue . If someone help me , i will be so grateful.

const { expect } = require(‘chai’);
const {
   getBaseUrl,
   getNewPage,
   closeBrowsers,
} = require(‘./_helpers’);

describe(‘Flow’, function(){
   this.timeout(0);

   beforeEach(function(){

   });

it(‘Create flow modal’, async() => {
       const page = await getNewPage();
       await page.goto(getBaseUrl() + ‘/flows’);
       await page.waitForSelector(‘[class*=create-flow]’, { timeout: 60 * 1000 });

       const CreateFlowButton = await page.$(‘button[type=submit]’);
       expect(!!!CreateFlowButton).to.be.true;
  });