const {assert} = require('chai');
const request = require('supertest');
const {jsdom} = require('jsdom');

const app = require('../../app');

const parseTextFromHTML = (htmlAsString, selector) => {
  const selectedElement = jsdom(htmlAsString).querySelector(selector);
  if (selectedElement !== null) {
    return selectedElement.textContent;
  } else {
    throw new Error(`No element with selector ${selector} found in HTML string`);
  }
};

describe('root page', () => {
  describe('GET request', () => {
    it('returns a 200 status', async () => {
      const response = await request(app).
      get('/');
      assert.equal(response.status, 200);
    });
    
    it('contains the correct title', async () => {
      const response = await request(app).
      get('/');

      assert.equal(parseTextFromHTML(response.text, '#page-title'), 'Messaging App')

    });
  });
});