chai VS jsdom

Let's configure tests with mocha, chai and sinon on Typescript in a few steps.

These options totally depend on your requirements. For example an empty hardhat option is a very basic project sample if you need more libraries, plugins or you use Typescript later, you have to add them manually. Like @nomiclabs/hardhat-waffle , [ethereum-waffle](https://www.npmjs.com/package/ethereum-waffle), chai , @nomiclabs/hardhat-ethers , ethers , [@openzeppelin/contracts](https://www.npmjs.com/package/@openzeppelin/contracts) Because, they'll allow us to interact with Ethereum and to test our contracts.

For those of you wondering what a "Chaijs" is like I was: https://github.com/chaijs/chai

> BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.

ES6 test setup with Mocha and Chai.

It'd be hard for me to imagine what would it be like back then to write tests if it wasn't for Enzyme. Even with Enzyme, it was noticeably harder than it is today, and I still vividly remember installing and configuring in my project Mocha, Chai, Sinon, and JSDOM, to get pretty much the same tooling that today a single library - Jest - provides out of the box, while adding numerous features on top of that.

The library offers a BDD testing style and fully exploits javascript promises - the resulting tests are simple, clear and expressive. Chakram is built on node.js, mocha, chai and request.

For this example, I am using Mocha, plus Chai for its BDD expect syntax and the chai-as-promised plugin for asynchronous matchers.

chai

If you happen to be using React Testing Library in your project, you'll need to keep the jsdom dev dependency installed.

Readability.js requires a DOM object to parse the readable content from a website. That's why we create a DOM object with JSDOM and provide the HTML from the page and its current URL. By the way, the browser may have had to follow HTTP redirects, so the current URL doesn't necessarily have to be the one we provided initially. The parse function of the library returns the following result:

This was the basic usage of JSDOM. If you want to learn more, please check out this documentation.

Web scraping, while immensely useful, often requires developers to navigate a sea of tools and libraries, each with its own quirks and intricacies. Whether it's JSDOM, Cheerio, Playwright, or even just plain old vanilla JS in the DevTools console, moving between these platforms can be a challenge.

React testing library uses jsdom (or others like happy-dom) under the hood to emulate the browser environment and enable testing of different properties. but it doesn't render the component in an actual browser meaning the styles can't be computed and the returned computed style is just an object with the correct keys but empty strings as values.

Note: In order to use the library jsdom to scrape the HTML response we need to avoid the @import statements in the CSS.

The code uses jSDom to render the app but I was wondering if it's possible to run the app without the UI to be able to use a library like that to generate the string from react element.

JSDOM as the DOM environment for running our tests