test template

[hjyssg]

// https://github.com/mochajs/mocha
// npm i mocha chai puppeteer

//  "scripts": {
//     "test": "mocha test.js"
// },

const puppeteer = require('puppeteer');
https://stackoverflow.com/questions/25678063/whats-the-difference-between-assertion-library-testing-framework-and-testing-e#:~:text=Assertion%20libraries%20are%20tools%20to,do%20thousands%20of%20if%20statements.
const { expect }  = require('chai');

describe('Duck Duck Go search using basic Puppeteer', function(){

    let browser;
    let page;

    //https://github.com/mochajs/mocha/issues/2586 
    //不用arrow function
    // Passing arrow functions (aka “lambdas”) to Mocha is discouraged. Lambdas lexically bind this and cannot access the Mocha context. 
    this.timeout(30*1000);

    before(async function() {
        // runs once before the first test in this block
        browser = await puppeteer.launch({
            headless: false
        });
    });

    after(async function() {
        // runs once after the last test in this block
        await browser.close();
    });

    beforeEach(async function() {
        page = await browser.newPage();
        await page.goto('https://duckduckgo.com');
    });

    afterEach(async function() {
       await page.close();
    });

    it('should have the correct page title', async function() {
        const title = await page.title();
        expect(title).to.eql('DuckDuckGo — Privacy, simplified.');
    });

    // it('should show a list of results when searching actual word', async () => {
    //     await page.type('input[id=search_form_input_homepage]', 'puppeteer');
    //     await page.click('input[type="submit"]');
    //     await page.waitForSelector('h2 a');
    //     const links = await page.evaluate(() => {
    //         return Array.from(document.querySelectorAll('h2 a'));
    //     });
    //     expect(links.length).to.be.greaterThan(0);
    // });

    // it('should show a warning when searching fake word', async () => {
    //     await page.type('input[id=search_form_input_homepage]', 'pupuppeppeteerteer');
    //     await page.click('input[type="submit"]');
    //     await page.waitForSelector('div[class=msg__wrap]');
    //     const text = await page.evaluate(() => {
    //         return document.querySelector('div[class=msg__wrap]').textContent;
    //     });
    //     expect(text).to.contain('Not many results contain');
    // });

});