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JSDom is a JavaScript implementation of the DOM and browser APIs that runs in Node.js. Jest uses JSDom to create a mock DOM for your tests, allowing you to test components and hooks that interact with the DOM.
While generally it's recommended to test the component using the hooks rather than the hooks themselves, sometimes you might find it necessary to test custom hooks directly. For such cases, there's React Hooks Testing Library. This library allows you to create a simple test harness for React hooks that handles running them within the body of a function component, as well as updating and unmounting them.
When testing components that make network requests inside useEffect, it can be helpful to control the responses to those requests. Mock Service Worker is a tool for mocking network requests directly in the browser. With MSW, you can create a mock server that intercepts your app's network requests and returns controlled responses.
Jest is a popular JavaScript testing framework developed by Facebook. It's packed with features like a zero-configuration setup for JavaScript and TypeScript, snapshot testing, async function testing, and mock functions. One of the most relevant features for testing useEffect is Jest's fake timers, which allow you to fast-forward or slow down time, a feature particularly useful for testing effects that involve delays or intervals.