javascript VS jest

You may be torn between those famous code styles, struggling to choose one between Airbnb JavaScript Style, Google JavaScript Style Guide, JavaScript Standard Style, or XO, among others.

// Follow Established Style Guides // Adhere to established style guides such as Airbnb JavaScript Style Guide or Google JavaScript Style Guide to maintain consistency across your codebase. // These style guides provide comprehensive rules and recommendations for variable naming, declaration, and usage. // Example: Airbnb JavaScript Style Guide // https://github.com/airbnb/javascript /** * Represents a person with a given name and age. * @typedef {Object} Person * @property {string} name - The name of the person. * @property {number} age - The age of the person. */ /** * Create a new person. * @param {string} name - The name of the person. * @param {number} age - The age of the person. * @returns {Person} - The newly created person object. */ function createPerson(name, age) { return { name, age }; } const person1 = createPerson("John", 30); const person2 = createPerson("Jane", 25); console.log(person1); console.log(person2);

Repository: airbnb/javascript

Instead of writing our own exhaustive list of JavaScript rules, we can use a ruleset defined by the developers at Airbnb, and then adjust it to suit our preferences. The Airbnb JavaScript Style Guide is well known among JavaScript developers and used by some big companies: Lonely Planet, National Geographic and Sainsburys to name a few. It’s a great place to start.

Airbnb Style Guide

# question 1: ? How would you like to use ESLint? … To check syntax only To check syntax and find problems ❯ To check syntax, find problems, and enforce code style # question 2: ? What type of modules does your project use? … ❯ JavaScript modules (import/export) CommonJS (require/exports) None of these # question 3: ? Which framework does your project use? … ❯ React Vue.js None of these # question 4 (select "No", because we won't add TypeScript support for this project): ? Does your project use TypeScript? › No / Yes # question 5: ? Where does your code run? … Browser ✔ Node # question 6: ? How would you like to define a style for your project? … ❯ Use a popular style guide Answer questions about your style Inspect your JavaScript file(s) # question 7 (we'll rely on Airbnb's JavaScript style guide here): ? Which style guide do you want to follow? … ❯ Airbnb: https://github.com/airbnb/javascript Standard: https://github.com/standard/standard Google: https://github.com/google/eslint-config-google # question 8: ? What format do you want your config file to be in? … JavaScript YAML ❯ JSON # the final prompt here is where eslint will ask you if you want to install all the necessary dependencies. Select "Yes" and hit enter: Checking peerDependencies of eslint-config-airbnb@latest The config that you have selected requires the following dependencies: eslint-plugin-react@^7.21.5 eslint-config-airbnb@latest eslint@^5.16.0 || ^6.8.0 || ^7.2.0 eslint-plugin-import@^2.22.1 eslint-plugin-jsx-a11y@^6.4.1 eslint-plugin-react-hooks@^4 || ^3 || ^2.3.0 || ^1.7.0 ? Would you like to install them now with npm? › No / Yes

Extensible : ESLint supports the use of plugins and custom rules, enabling you to extend its functionality to suit your project requirements. Notably, there are popular ESLint plugins that align with well-established coding standards and styles. Examples include Airbnb JS Style Guide and Google JS Style Guide.

An obvious pick for React projects, but eslint-plugin-react along with their plugin:react/recommended rule set is a must. This will give you some sensible rules such as requiring a key to be specified in JSX arrays. eslint-config-airbnb is another good (if a bit loose) base rule set on top of eslint-plugin-react to start from.

There are several testing approaches you can take to ascertain the functionality of the auth API. One way would be to automate the testing using unit tests with tools like Jest and Supertest. Alternatively, you can make use of API clients like Postman or the Thunder Client VS Code extension to test the API.

GitHub | Website

Jest

you have selected a testing framework. In my case, it's Jest with Supertest

Jest, created and maintained by Facebook, is a JavaScript testing framework with a focus on simplicity. It is often recognized for its zero-configuration setup and seamless integration, especially with React applications, making it a favored choice for developers in both small-scale projects and large enterprise applications.

Jest (https://jestjs.io/)

console.error Jest encountered an unexpected token Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. By default "node\_modules" folder is ignored by transformers. Here's what you can do: • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it. • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript • To have some of your "node\_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. • If you need a custom transformation specify a "transform" option in your config. • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option. You'll find more details and examples of these config options in the docs: https://jestjs.io/docs/configuration For information about custom transformations, see: https://jestjs.io/docs/code-transformation

Note: I will be using Jest as testing framework throughout the examples.

We use Jest Framework for testing. Jest is not a dogma, and, of course, in its place can be any other test runner, such as Mocha or Ava. Let's focus on tests. I'll provide a short example because I don’t want to waste your time. You can find the full version here. It's crucial to read the comments in the code below. Let's go!

Jest has long been my favorite got to test runner when it comes to UI unit and integration testing. With tools like React Testing Library (Testing Library framework for React) you get the benefit of very easy to write and maintain tests, as well as a quick and efficient way to run our tests.