The Art of Side Effects in React.js: Understanding and Using the useEffect Hook

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react-testing-library

React Testing Library is a set of helper functions for testing React components. It's designed to encourage writing tests that closely resemble how your React components are used. With React Testing Library, you can render components, fire events, find elements, and assert on their output. When testing useEffect, React Testing Library is useful because it automatically cleans up after each test, ensuring that effects don't leak between tests.

#Developer Tools #Testing #Automated Testing 113 social mentions

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Jest

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.

#Developer Tools #JavaScript Framework #Javascript Testing Framework 37 social mentions

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jsdom

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.

#Development #Automated Testing #Browser Testing 28 social mentions