It is an open-source JavaScript library created by Facebook and is used for managing the view layer for mobile and web applications. It is possible to present it on the server-side as well as the client-side. React JS helps simplify the process of mobile application development since the code that has been written at the time of website development can be used once again for creating a web app. React JS is ideal for continuing large amounts of information.
This particular framework has been ranked as the most popular JavaScript testing framework by the stateofjs survey. Facebook has created jest, and the main emphasis with this framework happens to be on simplicity. It offers decent cross-browser support and is used on a wide scale with Selenium for automated testing.
An integrated framework is provided by Jest, which does not need any experience when it comes to the configuration. This tool is all set to use, and it would be possible to set it up instantaneously by running the command-
npm install –save-dev jest
Your requirement will figure out whether it will be better to use Jasmine or Jest for your project. In case the project needs debugging the test cases in an IDE that is not supported by Jest, then your best choice would be Jasmine. However, it will be advisable to try out Jest, given that Facebook has been making lots of investments at present on this framework. Moreover, the React developers are also getting a positive experience after using Jest.
Let’s create sample react application by using following commands:
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import "@testing-library/jest-dom";
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import { render, unmountComponentAtNode } from "react-dom"; import { act } from "react-dom/test-utils"; let container = null; beforeEach(() => {  // setup a DOM element as a render target  container = document.createElement("div");  document.body.appendChild(container); }); afterEach(() => {  // cleanup on exiting  unmountComponentAtNode(container);  container.remove();  container = null; }); act(() => {  // render components }); // make assertions
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// Hello.jsx import React from "react"; const Hello = (props) => { Â var returnStmnt = ""; Â if (props.name) { Â Â Â returnStmnt = <h1>Hello, {props.name}!</h1>; Â } else { Â Â Â returnStmnt = <span>Hey, stranger</span>; Â } Â return <>{returnStmnt}</>; }; export default Hello;
// hello.test.js import React from "react"; import { render, unmountComponentAtNode } from "react-dom"; import { act } from "react-dom/test-utils"; import Hello from "./Hello"; let container = null; beforeEach(() => {  // setup a DOM element as a render target  container = document.createElement("div");  document.body.appendChild(container); }); afterEach(() => {  // cleanup on exiting  unmountComponentAtNode(container);  container.remove();  container = null; }); it("renders with or without a name", () => {  act(() => {    render(<Hello />, container);  });  expect(container.textContent).toBe("Hey, stranger");  act(() => {    render(<Hello name="Mark" />, container);  });  expect(container.textContent).toBe("Hello, Mark!"); });
Jatin Panchal is Founder & Managing Director of Rlogical Techsoft Pvt. Ltd, a custom web & mobile app development company specialized in Outsourcing Web Development Services, Android, iOS and IoT App development.
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