Testing React components

Jest provides a handful of functions that can be used to test React components. The list can be found at https://jestjs.io/docs/en/snapshot-testing.

React components and mocking components

Let's consider a React component, as shown in the following code and in the file Header.js:

import React from "react";
import Link from "react-router-dom/Link";
const Header = () => (
 <ul>
   <li>
     <Link to="/">Home</Link>
   </li>
   <li>
     <Link to="/about">Services</Link>
   </li>
   <li>
     <Link to="/topics">Contact Us</Link>
   </li>
   <li>
     <Link to="/topics...