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Jest is a JavaScript testing framework designed to ensure correctness of any JavaScript codebase. It allows you to write tests with an approachable, familiar and feature-rich API that gives you results quickly.
You can run Jest directly from the CLI (if it's globally available in your PATH, e.g. by yarn global add jest or npm install jest --global) with a variety of useful options. Here's how to run Jest on files matching my-test , using config.json as a configuration file and display a native OS notification after the run:
See React: Function and Class Components. Reminders that with Class components, we expect Jest to be used to test props and not methods directly. Now let's use React's test renderer and Jest's snapshot feature to interact with the component and capture the rendered output and create a snapshot file: Link.test.js.
Mar 17, 2023 · Jest is a framework that runs unit testing for each unit in isolation, supporting parallel testing. This makes it faster than other JavaScript testing frameworks. The Jest documentation is very easy to understand, especially for developers new to the test-driven development approach.
Jan 22, 2024 · A cohesive and fully-featured testing framework. You can set up code transforms, get coverage, set coverage thresholds, have an interactive CLI, run/skip single tests, mock/intercept modules, mock timers, create mock/stub/spies. Feature table for reference:
May 30, 2022 · Jest is a JavaScript testing framework built by Facebook and primarily designed for React-based applications, but is also used with Babel, JavaScript, Node, Angular, and Vue. It can be used to test NestJS , Next.js , and GraphQL , too.
Works out of the box for most JavaScript projects. 🏃🏽 Instant Feedback: Fast, interactive watch mode only runs test files related to changed files. 📸 Snapshot Testing: Capture snapshots of large objects to simplify testing and to analyze how they change over time. See more on jestjs.io.
