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Jest/Vitest interactive course (runs in the browser)

The page offers an interactive browser-based course teaching Jest and Vitest fundamentals for testing JavaScript applications.

Background

- Jest and Vitest are two popular JavaScript testing frameworks used to ensure code behaves as expected. Both let you write tests that assert whether functions, components, or modules return correct output for given input. - Vitest is a newer, faster alternative to Jest that gained traction in the Vue.js and Vite ecosystems. Jest has long been the default in React projects (via Create React App) and is backed by Meta. - Most testing courses require you to install Node.js, run command-line tools, and manage project files, which can be a barrier for beginners or anyone who just wants to learn the testing API quickly. - This course runs entirely in the browser — no local setup needed — making it immediately accessible to anyone with a web browser. It teaches the core concepts of writing unit tests with Jest and Vitest.

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